  Crowd employment is a new form of short term employment that has been rapidly
becoming a source of income for a vast number of people around the globe. It
differs considerably from more traditional forms of work, yet similar ethical
and optimization issues arise. One key to tackle such challenges is to
understand what motivates the international crowd workforce. In this work, we
study the motivation of workers involved in one particularly prevalent type of
crowd employment: micro-tasks. We report on the results of applying the
Multidimensional Crowdworker Motivation Scale (MCMS) in ten countries, which
unveil significant international differences.
