Collocations for speculation - noun

considerable, intense, much, widespread | further, increasing, renewed | continuing, endless | pure | mere
Whether or not he will get the job is mere speculation.

wild | idle, fruitless | rife
Speculation was rife as to whom the prince might marry.

media, press | metaphysical, philosophical

cause, encourage, fuel, give rise to, increase, intensify, invite, lead to, prompt, raise | dampen, discourage, end, put an end to | dismiss | indulge in

amid ~
He was dropped from the team amid speculation that he was seriously ill.

~ among
There was wild speculation among the students as to the reason for cancelling the lecture.

~ about/as to/on/over
There has been increasing speculation over the future of the monarchy.

a matter for speculation, a subject of speculation

financial | market | currency, land, property, etc.

~ against
speculation against the euro

~ in
speculation in oil

~ on
speculation on the stock market