6 ideas
Mandeville argues that the vices of individuals, including avarice, prodigality, pride, envy and vanity, are what drive consumption, employment and trade. A society's wealth rests on these appetites, not on moral restraint, so the vices of the many add up to the prosperity of the whole.
A thriving hive full of fraud, luxury and vanity complains about its own dishonesty, and Jove makes every bee honest. Lawyers, locksmiths, luxury trades and soldiers lose their work, the population shrinks, and the virtuous remnant retreats into a hollow tree to live in poverty. The fable illustrates that removing vice removes the demand that sustained the economy.
Mandeville claims moral virtues were invented by skillful politicians who used praise and shame to get people to suppress their appetites for the public good. People act 'virtuously' because they want to be admired, so pride underlies what passes for self-denial.
Mandeville defines virtue strictly as action against one's natural impulse, taken from a rational desire to be good. By that standard almost every apparent virtue, such as charity, courage or modesty, turns out to be motivated by self-love, fear of shame, or the pleasure of approval. The strict definition turns ordinary morality into a catalogue of disguised passions.
If luxury means anything beyond bare necessity, then nearly everything humans consume counts as luxury. Mandeville argues that demand for such comforts and refinements employs the poor and drives manufacturing and trade. Sumptuary restraint would therefore impoverish a nation rather than strengthen it.
Mandeville holds that private vices benefit the public only when the dexterous management of a skillful politician channels them. Laws, punishments and incentives direct selfish passions toward productive ends while restraining their destructive forms. Prosperity comes from engineering institutions around human nature, not from reforming it.