Cramer says 4 things—including the tax overhaul—will continue to push stocks higher

As the stock market resumed its march higher on Monday, CNBC’s Jim Cramer pinpointed the main drivers fueling the monstrous rally.

“First, let’s understand: this market is largely driven not by stock-pickers, but by index funds,” the “Mad Money” host said. “That index fund money comes in automatically, every day, over the transom. Billions of dollars placed in equities will move equities higher.”