NEW YORK (TheStreet) -- TheStreet's Jim Cramer says this has been an amazing time for mergers and acquisitions activity and calls it "an actual boom."

He notes the feeling that this boom could end if the Fed starts to tighten and the economy gets overheated, but he actually thinks 2015 will be an even bigger year for M&A than 2014.

Cramer says there has been no growth overseas, and the only way to stimulate that is to buy another company. Secondly, he says the activists will continue to get deals done.

Must Watch: Jim Cramer Says M&A Will Be Even Bigger in 2015 Than in 2014

STOCKS TO BUY: TheStreet Quant Ratings has identified a handful of stocks that can potentially TRIPLE in the next 12 months. Learn more.

Finally, he says these deals simply work. He points to Tyson Foods'  (TSN) - Get Report acquisition of Hillshire Brands  (HSH) as a prime example.

So Cramer says if M&A works, if the activists want it, and if there is no other growth, then M&A activity will increase in 2015.

STOCKS TO BUY: TheStreet Quant Ratings has identified a handful of stocks that can potentially TRIPLE in the next 12 months. Learn more.