Insider trading is wrong based on the theory that the insider -- the owner of some shares -- has a fiduciary duty to the company.

That's why there are no equivalents in commodities or real estate.

However, if Bezos were to buy a "ton" of real estate in the immediate area and then intervene in the process solely to enrich himself, the share holders of Amazon may feel they have used their money to enrich himself.

(I am not suggesting anything of the sort actually happened in this case.)