The concept of circular economy, as opposed to linear economy, is that material and energy are reused and recycled after use. One way of achieving this is to not throw away items you don't want anymore. Instead they can be resold in the second hand market. This week I went to the local Red Cross with a bag of stuff I don't need anymore. The Red Cross in Sweden runs a lot of second hand stores to help finance its activities. Other benefits are that people with less money can buy what the need, and that some of the staff are persons that get job and language training. When leaving things to the Red Cross, for some reasons, I always check out the store. So also this time. This time I came home with some books. One of them about Pikettys economical theory for the 21:st century. A perfect example of circular economy!