спекулировать

Etymology
Perhaps from ; see also.

Verb

 * 1)  to speculate, to profiteer, to gamble
 * 2)  to exploit, to take advantage of
 * 3) to speculate

Usage notes
Until fairly recently, спекули́ровать in Russian was used only in the financial sense: to make opportunistic investments. However, the word has increasingly adopted and been used with the additional English meaning: to make conclusions based on incomplete data.