If victory is a zero gender wage gap, some countries have achieved it already for single female workers and long ago according to the data charted below is from the Luxembourg Income Study.
Discrimination cannot explain why the gender wage gap for single female is tiny relative to the family wage gap. As Solomon Polachek explains:
…the wage gap for married workers is between three and 30 times greater compared with single workers.
Employers cannot be to blame for the large difference between the single female worker gender wage gap and the family wage gap.
Aside from explaining why employers only discriminate against married women, you must explain how employers managed to find out which female applicants are married so they can discriminate against them.
Without that vital information on the marital status of female applicants and the presence and number of children as well is their spacing, the vast male chauvinistic conspiracy responsible for the glass ceiling and the sticky floors against promotion does not get off the ground.
How do employers actually pay married women less? Advertising jobs that pay women less has been unlawful for decades. Yet another hurdle to overcome for the vast male chauvinistic conspiracy.
Women move between the large number of jobs as do men accumulating human capital as they go? Somehow employers, including female owned firms, must sabotage the accumulation of human capital by married women as soon as they have children but without paying them lessen in their current jobs or advertising jobs that pay married women less.
The main drivers of the gender wage gap are unknown to employers such as:
whether the would-be female recruit or employee is married,
whether their partner is present,
how many children they have,
how many of children are under 12, and
how many years are there between the births of their children.
These are the main drivers of the gender wage gap – all of which are factors totally unknown to employers and of no relevance to them in making a profit.
Most explanations of the gender wage gap centre around human capital. In anticipation of time outside of the workforce for motherhood, women self-selecting to occupations that penalise career interruptions less.
Women invest in human capital that is more general, human capital that is more mobile between jobs and into spells of part-time work. Women anticipate home time after they have children so they invest in human capital that depreciations at a slower rate during career interruptions. Women also invest less overall in new capital because they expect to spend less time in the labour market.
All of these investments are made by women themselves in anticipation of motherboard rather than employers somehow paying them less after they marry and have children.
The solution to closing the family wage gap requires radical biological changes in who has children. There are more radical changes required than this because mothers actually like babies and enjoy spending time with them rather than going to work.
Equally challenging is the required changes in the dating market. There is an average age difference between boyfriends and girlfriends and husbands and wives of 2 to 3 years. As the husband or boyfriend is a few years older, he has usually accumulated more human capital and is more likely to be at a critical career point for promotion.
Because the husband or boyfriend is 2 to 3 years older, it pays off well in terms of the father investing more in market-related human capital and the mother devoting more time to childcare.
Another major driver of the gender pay gap is the dating market as identified by Richard McKenzie. He pointed out that evolutionary psychology has found that in every culture one of the factors of influencing pairing off in the dating market is that the boyfriend or husband must have good prospects although this preference is weakening over this last century.
One of the reasons for the increase in single parents is that low-paid men are not as inviting prospects as long-term boyfriends or husbands is a few generations ago. There are too few good men.
University educated couples are not called power couples for nothing – their earning power is this stunning compared to going it on your own. The emergence of power couples means that less educated women may prefer to stay single and raise children on their own rather than marry what is left in the marriage pool.
Because of the requirement among women across all cultures that husbands to be must have good prospects, men have an extra incentive to invest in human capital and work harder and longer hours because of the gender specific payoff in the marriage market.
‘Equal Pay Day’ this year is April 12; the next ‘Equal Occupational fatality day’ will be in the year 2027 https://t.co/tZrS2UFq1P
Men will also take more risks than women because risky jobs carry wage premiums. That risk premium is topped up in the mating market terms are marriage prospects because of the higher wages. Women get a wage premium for taking risky jobs but less of a payoff in the mating market for the higher wages. There is an evolutionary psychology explanation for the family wage gap.
All in all, a key requirement for the closing of the family wage gap and what little is left of the gender wage gap is women drop their standards in terms of who they choose as boyfriends and husbands. Not very likely.
Workplace safety arises as a by-product of economic growth. Risks in the workplace and outside that would not countenance now were routine a few decades ago because the risk of eliminating them was high.
The soon to take effect New Zealand health workplace safety legislation makes it much more difficult to have independent directors and part-time directors of companies. That will both weaken the ability of shareholders to prevent insider control as well as introduce a diversity of views onto boards of directors.
The resignation of Sir Peter Jackson is an example of this. Talented entrepreneurs are no longer able to run large numbers by sitting on the board and intervening on a management by exception basis.
Rupert Murdoch as an example of an executive able to run a global empire. He would ring up the chief executives of his subsidiaries for one minute to month. If they are talking about something interesting, he would listen for longer. He was the ultimate one-minute manager who built a global empire around his supreme entrepreneurial talent.
The new legislation on workplace safety will increase the cost of building a successful business from the ground up. Entrepreneurs will not be able to quickly intervene in the company and dismiss underperforming executives who look after things while they are away. This is because they are not on the Board of Directors.
One constraint on the growth of any firm is entrepreneurs have a limited span of control (Coase 1937; Williamson 1967, Lucas 1978; Oi 1983a, 1983b). A span of control is the number of subordinates that an individual supervisor has to control and lead either directly or through a hierarchical managerial chain (Fox 2009). There are only so many tasks that even the most able of entrepreneurs can carry out in one day. Over-stretched spans of control motivate entrepreneurs to hire professional managers and delegate to them a wide range of decision-making rights over the firms they own (Williamson 1975; Foss, Foss and Klein 2008).
Entrepreneurs and the professional managers they hired to assist them must divide their respective time between monitoring employees, identifying new business opportunities, forecasting buyer demand and running the other aspects of their business (Lucas, 1978; Oi 1983, 1983b, 1988; Foss, Foss, and Klein 2008). The larger is the firm, the more employees there are for the entrepreneur to direct, monitor and reward. These costs of directing and monitoring employees will increase with the size of the firm and larger firms will encounter information problems not present in smaller firms (Alchian and Demsetz 1972; Stigler 1962)
The time of the more talented entrepreneurs is more valuable because they had the superior managerial skills and entrepreneurial alertness to make their firms large in the first place and remain deft enough to survive in competition. Time spent on the supervision of employees is time that is spent away from other uses of the talents that got these more able entrepreneurs to the top and keeps them there (Williamson 1967; Lucas 1978; Oi 1983b, 1988, 1990; Idson and Oi 1999; Black et al 1999).
Firms in the same industry tend to exhibit systematic differences in their organization of production and the structure of their workforces because entrepreneurial ability is the specific and scarce production input that limits the size of a firm (Lucas, 1978; Oi 1983b). The less able entrepreneurs tend to run the smaller firms while the better entrepreneurs tend to lead both the currently large firms and the smaller firms that are growing at the expense of market rivals (Lucas 1978, Oi 1983b; Stigler 1958; Alchian 1950).
There has been a tremendous improvement in the working conditions over the 20th century. The main driver was the incentive and employers to provide safe workplaces as real wages grew. Adam Smith noted that more dangerous and unpleasant jobs always attracted a wage premium as he explains in the Wealth of Nations:
The five following are the principal circumstances which, so far as I have been able to observe, make up for a small pecuniary gain in some employments, and counterbalance a great one in others: first, the agreeableness or disagreeableness of the employments themselves; secondly, the easiness and cheapness, or the difficulty and expense of learning them; thirdly, the constancy or inconstancy of employment in them; fourthly, the small or great trust which must be reposed in those who exercise them; and, fifthly, the probability or improbability of success in them.
First, the wages of labour vary with the ease or hardship, the cleanliness or dirtiness, the honourableness or dishonourableness of the employment. Thus in most places, take the year round, a journeyman tailor earns less than a journeyman weaver. His work is much easier. A journeyman weaver earns less than a journeyman smith. His work is not always easier, but it is much cleanlier. A journeyman blacksmith, though an artificer, seldom earns so much in twelve hours as a collier, who is only a labourer, does in eight. His work is not quite so dirty, is less dangerous, and is carried on in daylight, and above ground.
Honour makes a great part of the reward of all honourable professions. In point of pecuniary gain, all things considered, they are generally under-recompensed, as I shall endeavour to show by and by. Disgrace has the contrary effect.
The trade of a butcher is a brutal and an odious business; but it is in most places more profitable than the greater part of common trades. The most detestable of all employments, that of public executioner, is, in proportion to the quantity of work done, better paid than any common trade whatever.
Hunting and fishing, the most important employments of mankind in the rude state of society, become in its advanced state their most agreeable amusements, and they pursue for pleasure what they once followed from necessity. In the advanced state of society, therefore, they are all very poor people who follow as a trade what other people pursue as a pastime. Fishermen have been so since the time of Theocritus. A poacher is everywhere a very poor man in Great Britain. In countries where the rigour of the law suffers no poachers, the licensed hunter is not in a much better condition. The natural taste for those employments makes more people follow them than can live comfortably by them, and the produce of their labour, in proportion to its quantity, comes always too cheap to market to afford anything but the most scanty subsistence to the labourers.
Disagreeableness and disgrace affect the profits of stock in the same manner as the wages of labour. The keeper of an inn or tavern, who is never master of his own house, and who is exposed to the brutality of every drunkard, exercises neither a very agreeable nor a very creditable business. But there is scarce any common trade in which a small stock yields so great a profit…
The wages in any particular job will vary with the risks that are known to the worker in that job. That is an important qualification.
Competition in labour markets ensures that the net advantages of different jobs will tend to equality. This theory of the labour market originating in Adam Smith, which drives much of modern labour economics became to be known as the theory of compensating differentials.
Firms can choose their production technology to offer workers greater safety or they can economize on safety and offer the savings to workers in the form of higher wages. There is a trade-off in offering more safety or higher wages, holding constant the level of profits. As Kip Viscusi explains:
Wage premiums paid to U.S. workers for risking injury are huge—in 1990 they amounted to about $120 billion annually, which was over 2 percent of the gross national product, and over 5 percent of total wages paid.
These wage premiums give firms an incentive to invest in job safety because an employer who makes his workplace safer can reduce the wages he pays. Employers have a second incentive because they must pay higher premiums for workers’ compensation if accident rates are high.
One of the effects of safety regulation is the employers no longer have to pay this wage premium in more dangerous or disagreeable jobs but as Fishback wrote:
Studies of wages before and after the introduction of workers’ compensation show, however, that non-union workers’ wages were reduced by the introduction of workers’ compensation. In essence, the non-union workers “bought” these improvements in their benefit levels.
Even though workers may have paid for their benefits, they still seem to have been better off as a result of the introduction of workers’ compensation. Many workers had faced problems in purchasing accident insurance at the turn of the century. Workers’ compensation left them better insured, and allowed many of them to spend some of their savings that they had set aside in case of an accident.
What literature there is about suggest that workers overestimate small risks and underestimate large risks. Surveys of manufacturing employment show that one third of workers quit because they found out the job they accepted was more dangerous than they expected.
One clear trend of the 20th century is as countries got richer, workers demanded more safety at work and larger wage premiums. Market incentives for better worker safety dwarf legal incentives such as from being sued, which in turn dwarf regulatory incentives.
There is also evidence of a glass coffin effect. About 95% of workplace deaths of men. Indeed, there are some interesting journal papers about how occupational choice is affected by motherhood, sole motherhood and sole fatherhood. Single parents are more cautious about their occupational choices.
CHART: Here's a gender gap I don't think most women want to close. Next "Equal Job Fatality Day" occurs in 2026. pic.twitter.com/MNlovX0j52
It is unfortunate that the unions in New Zealand opposes a risk based system of workers’ compensation. The current system is not only no fault, employers pay premiums based on the risks of their industry, not of their individual workplace. There is plenty of evidence to show the charging premiums based on the risks of an accident and the previous record of workplace safety greatly reduces workplace deaths and injuries as Viscusi explains:
The workers’ compensation system that has been in place in the United States throughout most of this century also gives companies strong incentives to make workplaces safe. Premiums for workers’ compensation, which employers pay, exceed $50 billion annually. Particularly for large firms, these premiums are strongly linked to their injury performance.
Statistical studies indicate that in the absence of the workers’ compensation system, workplace death rates would rise by 27 percent. This estimate assumes, however, that workers’ compensation would not be replaced by tort liability or higher market wage premiums.
Further reasons for women to hesitate entering STEM occupations is their faster rate of human capital depreciation. It has been well known for a long time that human capital atrophy rates differ greatly by occupation and are much higher in professional, managerial and craft occupations.
Source: Polachek (1981).
Even a year out of the workforce can greatly reduce earning power because of a rapid depreciation of the human capital accumulated from certain occupations. Women make education and career choices that minimise these losses in light of periods away from work because of motherhood.
Women self-selecting to those occupations with low rates of human capital depreciation. As De Grip explains using German data:
…women who anticipate career interruptions for family reasons take account of the wage penalties related to such a break when they choose their occupational field, i.e. women select occupations where human capital deprecation during a career interruption is the lowest…
Our estimation results have important implications for public policies which attempt to encourage the interest of female students in technical studies and occupations. Obviously, the higher human-capital depreciation rates for workers with family-related career breaks in these male occupations can be a serious threshold for women to choose these occupations
Women choose the occupations that maximise the returns from their skills. Occupations that neither well-reward superior verbal and reading skills and have rapid rates of depreciation on occupational human capital are not a good investment for many of the women anticipating spells out of the workforce because of motherhood.
Rendall and Rendall (2015) recently investigated differential depreciation rates on verbal and maths skills in competing occupational choices for college educated women. Not surprisingly, they found that in the USA verbal skills suffered only minor depreciation during career interruptions but maths skills experience costly depreciation. They found that:
…college educated women avoid occupations requiring significant math skills due to the costly skill atrophy experienced during a career break. In contrast, verbal skills are very robust to career interruptions. The results support the broadly observed female preference for occupations primarily requiring verbal skills – even though these occupations exhibit lower average wages.
Thus, skill-specific atrophy during employment leave and the speed of skill repair upon returning to the labour market are shown to be important factors underpinning women’s occupational outcomes. This research suggests that a substantial portion of female occupational sorting could be determined by skill-specific atrophy-repair characteristics.
This is no surprise as verbal skills improve with age because of expanding vocabularies and better judgement based on accumulated experience. Maths skills tend to be the type of skills where your best years in your 20s and after that things fall away.
These findings by Rendall and Rendall reinforce the initial bias women have against STEM occupations because of their superior reading and verbal skills. STEM occupations are a poor career choice for women because they undervalue their innate skills and heavily penalise career interruptions.
Such is the fatal conceit of politicians is they want to encourage women to make poor education and occupational investments. Women self-selecting into vastly different occupations to men because they are smarter than the average politician about what is the best of them.
Differential atrophy rates on human capital as drivers of the gender wage gap and occupational segregation have nothing to do with the choices of employers – nothing to do with blameworthy behaviour on their part. The blameworthy behaviour can be explicit prejudice, implicit bias or statistical discrimination.
Much of occupational segregation is the result from self-selection by women into occupations on the basis of superior innate skills and the slow rates at which these verbal and reading skills depreciate with time both in general and with time away from the workforce.
Jim Feyrer put forward a clever hypothesis about the sudden decline in the average quality of managers as a major contributor to the 1970s productivity slowdown. His hypothesis is a good contribution to real business cycle theory because what could be more random a shock than a demographic shock arising from the baby boom.
Feyrer’s hypothesis builds on Robert Lucas’s theory of the entrepreneur and the optimal size of the firm. The better entrepreneurs can manage larger spans of control.
Specifically, these more talented entrepreneurs can spread their skills and vision over a larger workforce thereby raising its productivity and that of the firm. Better quality managers are better trainers, better leaders, better problem solvers and better at recruiting and retaining staff.
If managerial skill and talent accumulates with experience, an influx of young workers into the workforce with the influx of the baby boomers into the workforce will lower the average quality of entrepreneurs. This will show up empirically as a decrease in the average age of managers and with that their experience and skills.
With the average age of the labour force lower during the influx of the baby boomers, more marginal managers have to be promoted into managerial positions to supervise younger employees. Lower managerial quality will lower the productivity of the workforce as a whole.
If managerial talent and skill is to have any meaning, a more talented manager should be able to extract greater productivity from the same quality labour force. Lazear points out that
Supervision and management are fundamental in personnel economics and in the theory of the firm… Boss effects are large and significant. Most important, bosses vary substantially in their quality. A very good boss increases the output of the supervised team over that supervised by a very bad boss by about as much as adding one member to the team.
The influx of less able managers in the 1970s, as shown by a five-year reduction in the median age of US managers in the chart below, accounted for 20% of the observed productivity slowdown and resurgence in the 1970s and 1980s according to Feyrer. To fill vacancies, employers had to drop their hiring standards for managers.
When the median age of managers rose in the 1990s, and along with it the average of quality of management, this productivity slowdown was reversed. Both the increase in the decrease in the age of managers are random productivity shocks in the tradition of real business cycle theory.
The average age of the US manager was 38 in 1980 and 39 in 1990. There is no US managerial occupation with an average age of less than 40 in 2013. The fifth managerial occupation with the lowest managing age is food service managers. The highest outside of agriculture is chief executives,
One of the mocking tones directed at real business cycle theory is it was supposed to require a regular forgetting of technologies so that productivity fell and then the loss technologies were remembered a few years later to have a business cycle.
That forgetting and remembering is what happened with the average age of managers and labour productivity in the 1970s. Management quickly lost five years of experience then slowly regained it with matching productivity swings and roundabouts.
Feyrer is another addition to a long line showing that business cycles can arise from the sum of random shocks, rather than one big shock, as Prescott suggested in 1986:
Another Summers question is, Where are the technology shocks? Apparently, he wants some identifiable shock to account for each of the half dozen postwar recessions. But our finding is not that infrequent large shocks produce fluctuations; it is, rather, that small shocks do, every period.
Why Evolution is True is a blog written by Jerry Coyne, centered on evolution and biology but also dealing with diverse topics like politics, culture, and cats.
In Hume’s spirit, I will attempt to serve as an ambassador from my world of economics, and help in “finding topics of conversation fit for the entertainment of rational creatures.”
“We do not believe any group of men adequate enough or wise enough to operate without scrutiny or without criticism. We know that the only way to avoid error is to detect it, that the only way to detect it is to be free to inquire. We know that in secrecy error undetected will flourish and subvert”. - J Robert Oppenheimer.
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