But investors seem to be overlooking the risk of a U.S. government default resulting from a failure by Congress to raise the debt ceiling. The possibility is greater than anyone seems to realize, even with a supposedly unified government.

In particular, the markets seem to be ignoring two vital numbers, which together could have profound consequences for global markets: 218 and $189 billion. In order to raise or suspend the debt ceiling (which will technically be reinstated on March 16), 218 votes are needed in the House of Representatives. The Treasury's cash balance will need to last until this happens, or the U.S. will default.

The opening cash balance this month was $189 billion, and Treasury is burning an average of $2 billion per day – with the ability to issue new debt. Net redemptions of existing debt not held by the government are running north of $100 billion a month. Treasury Secretary Steven Mnuchin has acknowledged the coming deadline, encouraging Congress last week to raise the limit immediately.