Mehrotra said the additional rate for PC flash drives in 2017 is about 35 percent, and will increase to 75 percent by 2020. And "a lot of hard drives still need to be replaced by SSDS... Future self-driving vehicles are expected to be equipped with about 40GB of DRAM... This will also drive the use of NAND flash memory." In the week ended Dec. 15, U.S. crude stocks fell 520 barrels to 438.7 million barrels, the API said, with analysts predicting a decrease of 3518,000 barrels. Cushing's crude inventories rose by 70,000 barrels. Canning's 1929 book, economics in accounting, cites the economist's view that asset values are determined by the present value of the future cash flows of assets. Adam Smith began as a logical starting point for "the personal gratification of the activity of personal gratification," and the market was "laissez-faire". The activities of the government completely unable to intervene in the pursuit of personal wealth, also don't have to worry about the laissez-faire altogether will create chaos, "an invisible hand" will be taking the laissez-faire personal economic activities arranged in perfect order. In other words, Adam Smith's market concept focuses on limiting government interference in individual economic activities. The wealth of nations also spends a considerable amount of time attacking the mercantilist policies that interfere with individual economic activity and limit individual economic power (property rights). Later classical economists stuck to their laissez-faire views. "We're seeing more and more frantic promotions and discounts on the streets this week," she said. "the impact on consumers is not what it used to be." Central bankers' tasks are limited to keeping inflation stable and independence easier to maintain. Given this narrow mandate, the allocation of central bank decisions is limited. Moreover, it is easier to explain how the central bank's policy tools are linked to its political mandate. But how long can anyone support "god and the gun" at the cost of "bread and butter"? The meditationist populists who presided over the Roman empire knew that the populist mob needed material and diversion: bread and circuses. Angry twitter makes no sense to those who can barely afford to live with dignity, let alone tickets to the modern Colosseum to watch football matches.