When did the kings of egypt begin to be called pharaoh?

The word came to be used metonymically for the Egyptian king under the New Kingdom (starting in the 18th dynasty, 1539–1292 bce), and by the 22nd dynasty (c. 945–c. 730 bce) it had been adopted as an epithet of respect.

food chain i would say only because there is competition on getting food and survival

the installment plan of the 1920s, an arrangement that allowed people to buy what they wanted with a small down payment and pay off the rest in monthly installments, provided americans a way to own what they did not have the money to buy.