%0 Journal Article %T Factors of changing demand for the food market of Saint Petersburg %A Nikonova, G.N. %A Nikonov, A.G. %K demand in the food market, cash income, purchasing power of the population; retail prices, COVID-19 pandemic %J Agrarian Bulletin of the %D 2021 %N 0 %P 8 %I Ural State Agrarian University