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Investors brushed off two so-called “black swan events” in the last week – events that historically would have fueled sharp retractions and instability in global financial markets, according to Fox Business host Charles Payne.

Cash available to banks for their short-term funding needs all but dried up on Monday and Tuesday, and interest rates in U.S. money markets shot up to as high as 10{fdbcabf771828492f9ea8159017cf64899a634f8417cacba890e13c34db45301} for some overnight loans, more than four times the Fed’s rate.

That forced the Fed to make an emergency injection of more than $50 billion, its first since the financial crisis more than a decade ago, to prevent borrowing costs from spiraling even higher. It will conduct another one on Wednesday.

The U.S. cash crunch came on the heels of this weekend’s crippling attack on Saudi Arabia’s oil infrastructure, which officials have blamed on Iran.

U.S. officials told Fox News on Tuesday that Iranian cruise missiles and drones were both used in the attack on the two Saudi Arabian oil facilities, and that they were fired from inside southwest Iran.

Wednesday morning, WIBC host Tony Katz spoke with Fox Business host Charles Payne about the specifics of the U.S. cash crunch, plus, how long it will take for oil markets to stabilize. Click below to check it out.