Meet Mason Wartman

Mason left his job on Wall Street to start up his pizza business in Philly.

Mason sells a slice of pizza for $1 in his restaurant...

His customers started paying it forward by paying for a slices of pizza for the next person.

Mason places a pay it forward 'post-it' on the wall:

Whenever someone hungry comes in, they can just grab a post it off the wall to pay for their meal. 

Mason's restaurant feeds around 40 homeless people every day.