Price promotions like “buy-one-get-one-free” deals are abundant in grocery retailing and many households buy on promotion to save on groceries. Yet, price promotions are also often criticized for causing household food waste. Such criticism rests on the assumption that larger-than-usual purchases are excessive and, therefore, inherently wasteful. Yet, this logic has never been tested empirically. In this project, I combine unique household panel data covering all grocery purchases of a representative set of households with survey data on usage of products, including wasting. Together, these data will show whether price promotions are to blame for household food waste.