$Amazon (AMZN.US)$ is seeing heavy buying of call options that give the holders the right to buy the stock at $175 by Friday. That mirrors the rally in shares amid signs of continued strength among U.S. consumers, bolstering the investment appeal of the largest e-commerce platform.
As of 1:30 p.m. in New York, more than 42,990 of those $175 calls changed hands, exceeding open interest which totaled 26,840. Amazon's 3.6%...