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waste matter that is introduced directly and indirectly into the environment by human activities and leads to the build up of unwanted materials.
the percentage of the population living in urban areas as a proportion of the total population...
goods that are in plentiful supply and do not command a price (such as air and sunshine).
the process where commercial banks lend out the money that they receive as deposits and grant...
the change in the firm's total revenue as a result of selling an extra unit of output