The head female of a paper-wasp nest allows others to occupy space in her home—so long as they help raise her offspring. The labor market is, however, elastic: if other nests nearby have childcare needs, she maintains a lower work requirement from her “helper” wasps.

In the eighteenth century, a cash-strapped French government began selling rente viagère, in which an investor paid an up-front sum pegged to someone’s life—sometimes the king or the pope—and received returns until death. A group of Genevan bankers diversified their portfolio in the 1770s by buying rente contracts on the lives of thirty wealthy young Genevan girls. The fund gained popularity; by 1789 a significant portion of French debt was owed on the lives of just these “thirty heads.”

A hand’s primary function, Elias Canetti writes in Crowds and Power, is as “a claw to grasp whole branches” while climbing; both hands partner in “grasping” and “letting go.” This is like trade, he argues: “one hand tenaciously holds on to the object with which it seeks to tempt the stranger” while the other “is stretched out in demand.” Trading, then, offers “profound and universal pleasure” as “a translation into nonphysical terms of one of the oldest movement patterns.”

“Why do you wrong the gods so much?” Greek poet Athenaeus asks a sober party guest in a late second-century work. “You’re no use to the city if you drink water, / because you’re hurting the farmer and the trader; / whereas I increase their income by getting drunk.”

A fish seller in Kuwait began gluing googly eyes on rotting fishes’ eye sockets in August 2018 in an attempt to make his wares appear fresher; in response, a rival seller began marketing his own fresh fish as “without cosmetic surgery.” The story went viral online, bringing it to the attention of the Ministry of Commerce and Industry, which promptly shut the first shop down.