Dingjun is a senior pursuing an honors degree in Economics and Mathematics at the University of Minnesota. He is passionate about learning how Economics and Mathematics theories are used in applied research settings. Currently, he is an undergraduate research assistant at the Heller-Hurwicz Economics Institute.In the Heller-Hurwicz Economics Institute, he is currently studying how the market concentration of “superstar firms” has changed over the years using different measures to capture their size. In particular, he and Stuart are combining two data sources that are not generally used together (Compustat and IRS data) to find new measures of market concentrations. In mathematics, he is currently studying how the higher-order Laplacian learning method for semi-supervised graph-based machine learning would perform under a low label rate in classifying images. Here is Dingjun’s Mathematics blog.