Anyone wondering whether the business community is behind President Donald Trump only needs to look at financial markets for answers. Markets have been on a tear since the Republican won election in November. The has jumped more than 10 percent since, and the stock market in general has been off to one of the fastest starts ever for a new president.
For Mnuchin, that is a signal of optimism that the new administration will deliver on its promises for a booming economy.
"There's a lot of confidence in the Trump administration and in the desire to invest in the U.S.," he told CNBC in an exclusive interview Thursday. "This is a very competitive place to do business. We've got great companies, and you see that reflected in the markets."
During his first month in office, Trump has pushed an agenda that includes broad-based tax cuts, a reduction in regulations and a focus on government spending to upgrade the nation's aging infrastructure.
The markets have responded in kind, with the major averages getting a boost and a rush of investor money coming off the sidelines. Funds focused on U.S. stocks have taken in $52.3 billion in 2017 alone.
That's being seen in the administration as a victory.
"This is a mark-to-market business, and you see what the market thinks," Mnuchin said.
To be sure, the stock market is a risky indicator by which to judge progress.
Former President Barack Obama presided over the second-longest bull run in market history, but that translated into limited success on the economic growth front. The S&P 500 gained 167 percent during Obama's two terms, but GDP growth averaged just 1.6 percent.
However, Mnuchin said he "absolutely" believes the market is a good indicator of economic progress.
"We're in an environment where there's very attractive investment opportunities in the U.S., and I think that's reflective of the administration's goals and what the market thinks of it," he said.