Cold calling by brokers has turned into a hot industry, but it's easy to get burned.

As the techniques improved and enough fish were caught, it turned into an industry.

Far from being unusual, pretexting has turned into a small industry.

This phenomenon is being turned into a new industry.

Why not turn a book like this into an industry?

What was once a pastime has turned into a industry.

"They have turned it into an industry where you can show pricing power and earn an honorable return on capital," he said.

And people were actually buying them, turning this clothes-out-of-kites thing into an industry.

Hence, culture has turned into an industry and the cultural objects are looked at as products.

Indeed, Americans' quest for more and better organized space has turned closet systems into a $250-million industry.