U.S. investors and executives are suddenly expressing a lot more optimism about the economy -- giving incoming Federal Reserve chair Jerome Powell momentum to build on, Jim Cramer and other top market watchers say.

"There is a change in the environment," Cramer said during TheStreet's November Trading Strategies roundtable of market experts. "You speak to Bryan Jordan, who is the CEO of First Horizon (FHN - Get Report) [in the] heartland -- Tennessee -- and he says, 'Big change.' Big change in the country. People want to take risks, which is why I think that Powell is important. Because if they want to take risks and you can get a loan, you can expand."

Liz Anne Sonders, chief investment strategy at Charles Schwab Corp. (SCHW - Get Report) , said that she speaks to investors all of the time and "in the last month or two, I have noticed maybe not a 180-degree shift in attitude and sentiment, but a 120-degree shift.

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This article was written by a staff member of TheStreet.