Food prices and the wages of the poor: A low-cost, high-value approach to high-frequency food security monitoring

International food prices have become increasingly volatile in recent decades, with “global food crises†in 2008, 2011 and most recently in 2022. The 2008 crisis prompted international agencies to ambitiously extend their monitoring of domestic food prices in developing countries to strengthen early warning systems and food and nutrition surveillance. However, food inflation by itself is not sufficient for measuring disposable income or food affordability; for that, one must measure either changes in income or changes in an income proxy. Here we propose the use of a low-cost income proxy that can be monitored at the same high frequency and spatial granularity as food prices: the wages of poor unskilled workers. While not all poor people are unskilled wage earners, changes in the real “reservation wages†of low skilled activities are likely to be highly predictive of changes in disposable income for poorer segments of society (Deaton and Dreze 2002). We demonstrate this by estimating changes in “food wages†– wages deflated food price indices – during well-documented food price crises in Ethiopia (2008, 2011 and 2022), Sri Lanka (2022) and Myanmar (2022). In all these instances, food wages declined by 20-30%, often in the space of a few months. Moreover, in Myanmar we use a household panel survey data to show that the decline in food wages over the course of 2022 closely matches estimate declines in household disposable income and proportional increases in income-based poverty. We argue that the affordability of nutritious food for “all people, at all times†is a critically important dimension of food security, and we advocate for monitoring the wages of the poor as a cheap and accurate means of capturing that dimension.