Richard Wolff - The Truth About Modern Monetary Theory

A brief explanation of MMT by Richard Wolff, where he says the government does but need to borrow money when it wants to spend in the economy and can also print the money to pay off the national debt. 

MMT or Modern Monetary Theory is becoming a point of contention in the Democratic Party,. But what is it and what does it mean? How does a government, or a political candidate use modern monetary theory, Can modern monetary theory help end the debt or the national deficit?