a sustained fall in the proportion of national output accounted for by the industrial and manufacturing sectors of the economy, a process that is often accompanied by a decline in the number of people employed in industry (compare INDUSTRIALIZATION).
There is a well-established trend in advanced economics for the industrial sector to grow more slowly than the service sector, as shown in Fig. 38. For the UK, the share of industry in GDP fell from 43% in 1960 to 29% in 2002, while the share of services increased from 54% to 70%. Over the same period, employment in industry in the UK fell from 11.8 million in 1960 to 3.7 million in 2003.
Fig. 37 Deflationary gap. (a) The AGGREGATE SUPPLY SCHEDULE is drawn as a 45-degree line because businesses will offer any particular level of output only if they expect total spending (aggregate demand) to be just sufficient to sell all of that output. However, once the economy reaches the full employment level of national income (OY1), then actual output cannot expand further and at this level of output the aggregate supply schedule becomes vertical. (b) Alternatively, aggregate supply can be depicted in terms of the various levels of real national income supplied at each price level. Again, once the economy reaches the full employment level of real national income, the aggregate supply schedule becomes vertical. In both (a) and (b), if aggregate demand is at a low level (AD1), then actual output (OY) will be determined by the intersection of AD1 and the aggregate supply schedule at point A; this output (OY) is less than potential output (OY1), leaving an output gap. An output gap can be removed by the authorities by expanding aggregate demand to the full employment level of aggregate demand (AD2) where actual output (determined by the intersection of AD2 and the aggregate supply schedule at point B) corresponds with potential GNP.
Changes in sector shares may simply reflect changes in the pattern of final demand for goods and services over time, and as such may be considered a ‘natural’ development associated with a maturing economy. On the other hand, deindustrialization that stems from supply-side deficiencies (high costs, an overvalued exchange rate, lack of investment and innovation) which put a country at a competitive disadvantage in international trade (see IMPORT PENETRATION) is a more serious matter. In this case, deindustrialization often brings with it a fall in national output, rising unemployment and balance of payments difficulties.
The extent of deindustrialization in the UK was even more marked in the early 1980s because of Britain’s artificially high exchange rate, bolstered by UK oil exports, which caused Britain to lose overseas markets. See STRUCTURE OF INDUSTRY, STRUCTURAL UNEMPLOYMENT.
Fig. 38 Deindustrialization. The distribution of gross national product shows how the industrial sector in advanced economics grows more slowly than the service sector. The figures for industry include those for manufacturing. Source: World Development Report, World Bank, 2004.
delivered pricing the charging of a PRICE for a product that includes the cost of transporting the product from the manufacturer to the customer. The delivered prices quoted by a manufacturer might accurately reflect the actual costs of transportation to different areas, or alternatively, discriminatory prices might be used to cross-subsidize areas in order to maximize sales across the country. See BASING POINT PRICE SYSTEM.
delivery note a document sent by a supplier to a customer at the time when products are supplied that itemizes the physical quantities of product supplied. Thereafter an INVOICE is usually sent to the customer showing the money value of products supplied. Compare STATEMENT OF ACCOUNT.
demand or effective demand the WANT, need or desire for a product backed by the money to purchase it. In economic analysis, demand is always based on ‘willingness and ability to pay’ for a product, not merely want or need for the product. CONSUMERS’ total demand for a product is reflected in the DEMAND CURVE. Compare SUPPLY.
demand curve a line showing the relationship between the PRICE of a PRODUCT or FACTOR OF PRODUCTION and the quantity DEMANDED per time period, as in Fig. 39.
Most demand curves slope downwards because (a) as the price of the product falls, consumers will tend to substitute this (now relatively cheaper) product for others in their purchases; (b) as the price of the product falls, this serves to increase their real income, allowing them to buy more products (see PRICE EFFECT, INCOME EFFECT, SUBSTITUTION EFFECT). In a small minority of cases, however, products can have an UPWARD-SLOPING CURVE.
The slope of the demand curve reflects the degree of responsiveness of quantity demanded to changes in the product’s price. For example, if a large reduction in price results in only a small increase in quantity demanded (as would be the case where the demand curve has a steep slope) then demand is said to be price inelastic (see PRICE-ELASTICITY OF DEMAND).
The demand curve interacts with the SUPPLY CURVE to determine the EQUILIBRIUM MARKET PRICE. See DEMAND FUNCTION, DEMAND CURVE (SHIFT IN), DIMINISHING MARGINAL UTILITY, MARGINAL REVENUE PRODUCT.
Fig. 39 Demand curve. Demand is the total quantity of a good or service that buyers are prepared to purchase at a given price. Demand is always taken to be effective demand, backed by the ability to pay, and not just based on want or need. The typical market demand curve slopes downwards from left to right, indicating that as price falls more is demanded (that is, a movement along the existing demand curve). Thus, if price falls from OP1 to OP2, the quantity demanded will increase from OQ1 to OQ2.
demand curve (shift in) a movement of the DEMAND CURVE from one position to another (either left or right) as a result of some economic change other than price. A given demand curve is always drawn on the CETERIS PARIBUS assumption that all the other factors affecting demand (income, tastes, etc.) are held constant. If any of these changes, however, then this will bring about a shift in the demand curve. For example, if income increases, the demand curve will shift to the right, so that more is now demanded at each price than formerly. See Fig. 40. See also DEMAND FUNCTION, INCOME-ELASTICITY OF DEMAND.
Fig. 40 Demand curve (shift in). An increase in income shifts the demand curve D1D1 to D2D2, increasing the quantity demanded from OQ1, to OQ2. The magnitude of this shift depends upon the INCOME ELASTICITY OF DEMAND for the product.
demand deposit see BANK DEPOSIT, COMMERCIAL BANK.
demand elasticity see ELASTICITY OF DEMAND.
demand for a factor input see DERIVED DEMAND.
demand function a form of notation that links the DEPENDENT VARIABLE, quantity demanded (Qd), with various INDEPENDENT VARIABLES that determine quantity demanded such as product price (P), income (Y), prices of substitute products (Ps), advertising (A), etc.:
Qd = f(P, Y, Ps, A, etc)
Changes in any of these independent variables will affect quantity demanded, and if we wish to investigate the particular effect of any one of these variables upon quantity demanded, then we could (conceptually) hold the influence of the other independent
