Is the economy Reagan's fault? If so, how?

I often see on here, liberals blaming Bush for our economic woes. And I can totally understand that to a great degree. But I also see many who say that a lot of these problems started with Reagan. My question is: what do you base that on? What policies or actions of Reagan's administration caused such terrible economic problems that they still plague us 20 years later? Inflation, prime rates, and unemployment all went down. He spent a lot, but no more than Obama has. And the average income of all brackets went up over his term, with the middle cl' income rising 13%. And he did this after inheriting a terrible economy from Carter.