William Stanley Jevons,
Political economy
“ Why Pearls are valuable. To make this still more plain, let us endeavour to answer this difficult question, "Do men dive for pearls because pearls fetch a high price, or do pearls fetch a high price because men must dive in order to get them?" Pearl-diving is a very dangerous and laborious kind of work. The divers have to jump into the deep sea with heavy weights to carry them down, and they must hold their breath a long time while they are engaged in collecting the oyster shells at the bottom. ”
