There are five counter-balancing circumstances:
(1) Wages vary with the agreeableness of the employment.
Some very agreeable employments are exceedingly ill paid.
The same thing is true of profits.
(2) Wages vary with the cost of learning the business.
The cost of apprenticeship accounts for the wages of manufacturers being higher than those of country labourers
Education for liberal professions is more costly and the pecuniary recompense consequently higher. Profits are not much affected by this circumstance.
(3) Wages vary with constancy of employment.
Constancy does not affect profits.
(4) Wages vary with the trust to be reposed.
Profits are unaffected by trust
(5) Wages vary with the probability of success.
Law and similar professions are nevertheless crowded.
Public admiration makes a part of the reward of superior abilities,
except in the peculiar case of players, opera-singers, &c.
The greater part of men have an over-weening conceit of their abilities:
lotteries show that the chance of gain is over-valued,
and the moderate profit of insurers shows that the chance of loss is undervalued.
Young people are particularly prone to over-value the chance of gain and under-value the risk of loss.
For this reason soldiers are poorly paid,
and sailors not much better.
Dangers which can be surmounted attract, though mere unwholesomeness repels.
Profits vary with certainty of return.
Profits are less unequal than wages, and their inequality is often only due to the inclusion of wages,
as in the case of the profit of an apothecary,
or country grocer.
The greater difference between retail and wholesale profits in town than country is due to the same cause.
The lesser rate of profit in towns yields larger fortunes, but these mostly arise from speculation.
The five circumstances thus counter-balance differences of pecuniary gains,
but three things are necessary as well as perfect freedom:
(1) the employments must be well known and long established,
since new trades yield higher wages,
and higher profits:
(2) the employments must be in their natural state,
since the demand for labour in each employment varies from time to time
and profits fluctuate with the price of the commodity produced:
and (3) the employments must be the principal employment of those who occupy them, since people maintained by one employment will work cheap at another, like the Scotch cotters,
Shetland knitters,
Scotch linen spinners,
and London lodging house keepers.