We analyse the velocity of several complementary currencies, notably the WIR, RES, Chiemgauer, Sol, Berkshares dollars, and several other cases. Then we describe the diversity in their velocity of circulation, and seek potential explanations for these differences. For example, WIR velocity is 2.6 while RES velocity is 1.9 despite being similar currencies. The higher speed may be explained by WIR blended loans among other benefits or by the fact that there are nearly 20.000 unregistered members that contribute with their transactions. Using a comparative method between cases, the article explores a number of possible explanations on the increases in velocity, apart from prevailing demurrage approaches
