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In economics, aggregate demand (AD) or domestic final demand (DFD) is the total demand for final goods and services in an economy at a given time. [1] It is often called effective demand, though at other times this term is distinguished. This is the demand for the gross domestic product of a country.
The AD–AS model is a common textbook model for explaining the macroeconomy. [55] The original version of the model shows the price level and level of real output given the equilibrium in aggregate demand and aggregate supply. The aggregate demand curve's downward slope means that more output is demanded at lower price levels. [56]
If income were to change, for example, the effect of the change would be represented by a change in the value of "a" and be reflected graphically as a shift of the demand curve. The constant b is the slope of the demand curve and shows how the price of the good affects the quantity demanded. [6]
The shelf usually ends at a point of increasing slope [3] (called the shelf break). The sea floor below the break is the continental slope. [4] Below the slope is the continental rise, which finally merges into the deep ocean floor, the abyssal plain. [5] The continental shelf and the slope are part of the continental margin. [6]
Erosional submarine canyons slope downward and lead to alluvial fan valleys with increasing depth. [2] It is in this zone that sediment is deposited, forming the continental rise. Alluvial fans such as the Bengal Fan, which stretches 3,000 kilometers (1,900 miles), make up one of the largest sedimentary structures in the world. [1]
These canyons are often V-shaped, and can sometime enlarge onto the continental shelf. At the base of the continental slope, there is a sudden decrease in slope angle, and the sea floor begins to level out towards the abyssal plain. This portion of the seafloor is called the continental rise, and marks the outermost zone of the continental ...
Subsided house, called The Crooked House, the result of 19th-century mining subsidence in Staffordshire, England Mam Tor road destroyed by subsidence and shear, near Castleton, Derbyshire Subsidence is a general term for downward vertical movement of the Earth's surface, which can be caused by both natural processes and human activities.
Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...