Security Amount (in Billions) Treasury Bills $ 220 Corporate Bonds 140 Treasury Notes 80 Corporate Stock 200 US Savings Bonds 60 Treasury Bonds 100 Other things equal, an increase of Treasury bonds from $100 billion to $120 billion in the economy would Multiple Choice not change the size of the public debt. increase the public debt from $460 billion to $480 billion. increase the public debt from $400 billion to $420 billion. decrease the public debt by $20 billion.