When Jim Cramer noticed that the market stayed high on Wednesday despite massive declines in two of its most important sectors, he had to investigate.

The “Mad Money” host watched swaths of the auto sector topple after auto parts retailer O’Reilly Automotive reported a stark earnings miss, with declines stretching as far as retailers Home Depot and Lowe’s, both of which have auto components to their sales.

“For the longest time, this kind of concentrated selling could bring the entire market down — makes sense given that autos and retail are so heavily linked to the overall economy,” Cramer said.

But on Wednesday, dramatic declines in both areas did not seem to drag the market down with them. Why?

“Because there have been some fundamental changes in the U.S. economy that are not being acknowledged by many people on air, on web, whatever, and they’re allowing the market to blossom without the traditional spurs of retail sales or autos,” the “Mad Money” host said.

Watch the full segment here:

More specifically, Cramer named 10 areas contributing to the market’s overall strength based on the 52-week high list he follows almost religiously: travel and leisure, health care, capital goods, oil and gas derivatives, the stay-at-home economy, defense, aerospace, housing, e-commerce and the banks.

First, Cramer sees travel and leisure’s boom as a direct result of millennials’ disinterest in material goods. They are choosing to spend their money on seeing and doing, in part due to the rise of the “selfie generation,” and in part because of a genuine desire to see the world, he said.

“Whatever, travel and leisure stocks, everything from hotels and time shares to airlines and cruises, live on the new-high list, and with good reasons: they all seem to have endless runs of better-than-expected earnings — remember, that’s what drives stocks — and, crucially, these industries employ a huge number of people,” Cramer explained.

Second, health care bills may be burdensome, but Cramer insists that…