English to Russian Bus/Financial Economics China's dual-track price reforms (textbook extract)

Although liberalization remained incomplete, dual-track price reforms did improve efficiency, because the price of the marginal unit reflected economic cost and correctly signaled relative scarcity, and because the share of sales at planned prices declined over time.
...поскольку стоимость предельной единицы продукции выявляла экономические затраты и служила адекватным признаком относительных дефицитов (товара)...?