What question does grendel grapple with throughout gardner's novel?

How was rockefeller able to build his monopoly across the oil industry? he found newer and cheaper ways to refine oil, increasing his profits. he confined his business to ohio so he could buy all the refineries there. he bought up oil refineries, cut costs, and reinvested his profits in other refineries. he began to sell kerosene as well as oil, expanding his market.

Diarys letters and memoirs are good examples of what

How might an economic depression impact people’s daily lives?