*My* suspicious yet not scientifically certified mind goes into mocking your whole comment.

1 - RTFA
2 - It is not a virtual simulation, they are using a bill tracking web site like the Canadian version of www.whereswilly.com which allows people to track where their money, specifically dollar bills go.
3 - They use real statistics from the site.
4 - Aren't most statistics at least +-2% because real life != idealized equations
5 - imho the real world usually != an ideal world