The top three posts of 2015 were characterized by links from other sites.
3. The irony of Paul Romer's mathiness
This received a link from the Econ Job Rumors forum. The post was about Romer's mathematical gotcha that didn't make economic sense in the real world.
2. This analysis is so bad
Scott Sumner linked to my criticism of the analysis he presented and a flood of comments and pageviews followed.
1. Mark Thoma, information equilibrium is the model you're looking for
Mark Thoma linked to my response to his piece in The Fiscal Times where I say the information equilibrium model magically solves all his problems.