The article deals with the problem of market prices dynamics during the blockade of Leningrad. The sources of the publication are documents of the authorities and Leningrad's administration, the NKVD, German intelligence agencies, diaries of blockade survivors. Special analysis of the declared topic was carried out in the paper for the first time. The main facts and trends of changes in market prices, primarily on bread, other food products, things and objects of daily demand, their correlation in commodity barter transactions are revealed. The main factors that determined the dynamics of market prices, the actions of participants in spontaneous private trade in Leningrad during the blockade were studied.