CNBC's 'Mad Money' host and veteran market commentator Jim Cramer has urged investors not to get nervous in the face of concerns like the Moody’s downgrade of U.S. debt . The U.S.'s rising debt stands at $36 trillion as of now.

If the U.S.’s loss of its final perfect credit rating boosts yields on Treasury debt, it likely would boost the cost of borrowing for both companies and consumers.

That legislation, which the Congressional Budget Office estimated will add $4.5 trillion to the deficit through 2034, proved to be the final straw for Moody’s. The credit agency had previously kept the U.S. in its top rung of borrowers since it first issued ratings for government bonds in 1919.

In the hours just before dawn, NASA's Perseverance rover adjusted its gaze toward the heavens and saw a brilliant point of light. That bright sparkle wasn't a morning star beaming from distant space,

A look at the day ahead in European and global markets from Ankur Banerjee Investors have taken in stride the Moody's U.S. credit rating downgrade and are back pining for trade deals as a distinct lack of agreements from negotiations keep them on edge with the clock ticking on the United States' 90-day pause.

Investors largely shrugged off a downgrade of the U.S.'s credit rating in Monday trading as stocks ended the day mostly flat.