Ameriks, Caplin, Leahy & Tyler (2007) study how lack of self-control may lead to overconsumption and low wealth accumulation. For their analysis, the authors calculate difference scores from their survey questions. We review their study and highlight potential issues in the use of difference...

The strategic importance of rare earth elements (REEs) has become increasingly important because of their relative scarcity and worldwide increasing demand, as well as China’s quasi-monopoly of this market. REEs are virtually not substitutable, and they are essential for a variety of...