Leonardo da vinci provides an excellent example or renaissanc's social ideal because?

Legacy of the new deal is positive or negative

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.

What were two theories put forth by marx?