he was specifically referencing a platinum bullion coin. The tweet is hyperlinked. Krugman wants a “platinum” coin. If you were reading correctly you have noticed that.
Whoopee that Krugman said ‘platinum’.
The actual LAW is that the Mint and the Treasury do not issue currency or coin that is linked to the value of the paper or metal used to depict a face value.
A one trillion dollar coin or note does not have to contain one trillion dollars worth of anything anymore than a $1 coin contains a dollar’s worth of metal.