People had been putting up more buildings on speculation than were needed.

He had warned that some of them were based on speculation.

These projects are not likely to be built on speculation.

It was much more comfortable to keep the department going on speculation, hope and fear.

He'd have to go ahead with the assignment on speculation.

He gave up on speculation and headed for the shop.

The first step is to build a Web site on speculation within 10 days.

He had no real evidence; nothing to go on but speculation and fear.

He said the first 1.25-million-square foot building would be built on speculation.

"Our game is based on the sound principles of investment rather than speculation."