Hi purplecafe: Total Money in circulation: 2007: 7456.5 billion 2015 sept: 12257.2 billion R=7456.5/12257.2 ==>0.60834 This raio tells that if we use 2007 dollar to measure today's SPX 2060x 0.60834 ==>1253 2007's SPX high was 1575 if we want to use today's dollar to measure 2007's high , we would get 1575/0.60834 ==>2589 ! This is the story .