On the Laws of Economics, 2018

Food and Agriculture Prices Across Countries and the Law of One Price (with Jiawei Si and Long Vo), 2017

Engel's Law, Diet Diversity and the Quality of Food Consumption (with Jiawei Si), 2017

Comments on Dirk Baur "Commodity Prices, Currencies and the Law of One Price", 2017

The Rotterdam Demand Model Half a Century On (with Grace Gao), 2015

Three Facts about World Metal Prices (with Mei-Hsiu Chen and Grace Gao), 2013

Milton Friedman, 2012

Quality, Quantity, Spending and Prices (with Grace Gao), 2012

Affluence & Food: A Simple Way to Infer Incomes (with Dongling Chen) 2010

The Big Mac Index Two Decades On: An Evaluation of Burgernomics (with Yihui Lan and Shi Pei Seah), 2009

The Demand for Marijuana, Tobacco and Alcohol (with Xueyan Zhao), 2008

Comments on Beau Kilmer et al. “Risks & Prices: The Role of User Sanctions in Marijuana Markets” , 2008