The Money Illusion: Market Monetarism, the Great Recession, and the Future of Monetary Policy by Scott Sumner
This book had interesting somewhat counter-intuitive views of the impacts of monetary policy. I didn't fully grasp all the details, but felt it could be a good way to look at things. "Easy" money is a key way that the government can help the economy. However, interest rates are often only a part of this. Often the anticipation of rates can be more critical than the actual rates set themselves. Common explanations we hear of for economic crashes are often side correlations. For instance, housing production had already stalled before the great recession. Some "fixes" may also make matters worse. (Encouraging unions and high wages at the start of the Great Depression likely stalled employment gains and production.) Macroeconomics uses the same terminology as microeconomics to describe something very different. Getting the right policies in place can help keep things humming along well, while the wrong policies can make things worse.
The author is very cautious about his beliefs. While he holds them strongly, he also feels that common culture is not likely to take them up until ready. He also notes that "liberal economics" will almost always "win", though the definition of "liberal economics" is always changing. Could we really keep the economy moving around nicely for a long term? Or would the thought of bubbles and crashes mean they must occur?