https://www.cnbc.com/2017/09/27/cramer-remix-if-you-want-a-better-economy-these-stocks-have-to-drop.html

Knowing when rallies are sustainable is critical to any investor's portfolio, so CNBC's Jim Cramer looked back on his decades of experience to pinpoint exactly what makes a rally trustworthy.

"There are such things as bad rallies," the "Mad Money" host warned. But Wednesday's jump on President Donald Trump's announcement on tax reform was not one of them, he said.