"Its development would set off a chain reaction through the entire world economy."

Any above will fall down and can form more groups for a chain reaction.

If I write up the chain reaction, the news will probably get out.

It's a chain reaction that is never going to stop.

Might there not be such a thing as a nuclear chain reaction?

And tomorrow he would set off a chain reaction in the system.

We still don't know what started the chain reaction on Thursday.

One drink set off everybody, of course, in a chain reaction.

That chain reaction here is what moved the job search along.

It's sort of a chain reaction, with me on the end and nobody to pass it along to.