Assume that the S&P $500$ composite stock index closes at $2,000.$ This means that. a$.$the average stock in the index is selling for $$20\mathrm{.}00,$ b$.$ an investor would have to pay $$2,000$ to purchase one share of each of the stocks represented in the index, c$.$ the average value of a company reflected in the Index has doubled from when the Index was at $1000,$ d$.$ the share prices of the stocks in the index have risen $20$ times since the $1941-1943$ base period.