What industry was John D Rockefeller a giant in?

Farmers were hit the hardest by the results of the stockmarket crash because? What is a pound in yen? What are the advantages of surplus production? What is the optimal combination of inputs? What effect would a higher BDC have on the characteristic curve you measured? Is the marginal benefit of a glass of water large or small? When money is not used and goods and services are exchanged for other goods and services this system is called? What is disadvantage of specialization? What types of goods were imported and exported from Venice? What is market is when theres a decline or expected decline in stock prices across the entire stock market? What is true about the economies of Norden? What does TERTIARY activity mean? What are economic importance of phylum coelenterate? What is travel propensity? What are the advantage of local purchase over imports? Why junk bonds pay a higher interest rate than government bonds of similar maturity? Which idea is the driving force for the free enterprise system? What is a major source of income for the economies of the Caribbean countries? What is the concept of opportunity cost and how does it impact decision-making by considering the loss of potential gain from other alternatives when one alternative is chosen? What was the rationale behind attempts of MG Rover to forge alliances?