Agriculture Thrived, Because Luxuries Become Neccessities

The currency of evolution is neither hunger nor pain, but rather copies of DNA helixes. Just as the economic success of a company is measured only by the number of dollars in its bank account, not by the happiness of its employees, so the evolutionary success of a species is measured by the number of copies of its DNA. If no more DNA copies remain, the species is extinct, just as a company without money is bankrupt. If a species boasts many DNA copies, it is a success, and the species

Yuval Noah Harari, Sapiens: A Brief History of Humankind (2011)

• consumption
• luxuries