personalconsumptionexpenditure and is determined by the consumption function, especially by the marginal propensity to consume.
Consumption can also be defined as "the selection, adoption, use, disposal and recycling of goods and services", as opposed to their design, production and marketing.
Consumption studies are difficult because they involve investigating everyday life situations, bringing research into the private domain, rather than formalised settings such as the workplace.
Personalconsumptionexpenditure (C) includes household expenditures on services, such as housing, utilities, transportation, and medical care, nondurable goods, such as food, clothing, and gasoline, and durable goods, such as motor vehicles, furniture, and household equipment.
In 1999, personalconsumptionexpenditure (C) was $6,257.3 billion, gross private investment (I) was $1,622.7 billion, government expenditure and investment (G) was $1,630.1 billion, and net exports (NX) were -$253.9 billion.
A very strong definition of sustainability would require all stocks of Kn to be maintained in addition to sustaining the per capita value of Q. The feasibility of these different definitions of sustainable economic development obviously depends on what value of Q or stock of Kn is chosen as the level to be sustained.
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