On Windows 10, the $WINDOWS.~BT folder contains your previous Windows installation. These files are used to downgrade to a previous version of Windows, or a previous build of Windows 10.
Aggregate Demand and Supply. The macroeconomic model for Aggregate Demand and Aggregate Supply differs from the microeconomic model in the fact that the AD/AS model represents all goods and not just one single good. It takes into account the price level of all goods as well as the overall aggregate output of the economy. Aggregate Demand (AD) represents the demand side of the economy. Long-run Aggregate Supply (LAS) represents the most output that an economy can sustain. Short-run Aggregate Supply (SAS) represents the supply of the economy in the short run.
ANSWERS TO END-OF-CHAPTER QUESTIONS. What are the four supply factors of economic growth? What is the demand factor? What is the efficiency factor? Illustrate these factors in terms of the production possibilities curve. The four supply factors are the quantity and quality of natural resources; the quantity and quality of human resources; the stock of capital goods; and the level of technology. The demand factor is the level of purchases needed to maintain full employment. The efficiency factor refers to both productive and allocative efficiency. Figure 17.1 illustrates these growth factors by showing movement from curve AB to curve CD.