Bid as much as you want. $60 or $60 trillion. There are no limits. Just write down any number you feel like. QE takes place during the 2008 recession. Each player acts as a central bank. You are enacting "Quantitive Easing" (QE) measures to stimulate the economy.
That just means you'll be spending money to bail out companies. Since you represent a nation, there is no limit to what you can spend. You get a marker and a blank check. Write any number you want.
Bid $1 and laugh at your competitors for overpaying. Or just keep writing zeros until you get tired. Maybe $1,000,000,000,000,000,000.
Every time you win the bid, you'll get more victory points.
But there is a catch.
At the end of the game, you will total up all your winning bids. Whoever paid the most total during the game loses. They are out. Then, the rest of the players score points based on collecting sets of companies, and the player with the most points wins. (Scoring is actually just a hair more complicated than that, and it is explained in detail all the way at the end.)