The sumerians were the worlds first civilization which of the following are they credited with First developing

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Explanation:

The Sumerians were the people of southern Mesopotamia whose civilization flourished between c. 4100-1750 BCE. Their name comes from the region which is frequently – and incorrectly – referred to as a “country”. Sumer was never a cohesive political entity, however, but a region of city-states each with its own king. Sumer was the southern counterpart to the northern region of Akkad whose people gave Sumer its name, meaning “land of the civilized kings”. The Sumerians themselves referred to their region simply as “the land” or “the land of the black-headed people”.

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.