 This study examined the use of mobile phone apps to collect price data from retail outlets in Nigeria. The data was then used to create a reweighted dataset that could be used to make more accurate inferences about food market prices. The results showed that the reweighted dataset was more accurate than the original dataset, suggesting that this method can be used to improve the quality of price data collected through crowdsourcing. This improved data can be used to inform government policies, as well as research and development efforts related to food security. This article was authored by Giuseppe Abia, Gloria Solana Hermesila, Pincenzo Nardelli, and others.