Cultural and political trends, economic forces and scientific/technical factors will interact to change the use of anthelmintics in animal agriculture. Obviously, the influence of these factors will be moderated by largely unpredictable shifts in economic and political climates around the world. None the less, they deserve serious consideration because they could markedly alter how anthelmintics are used in the future.

It is important for this discussion to distinguish (rather arbitrarily) between the economies of two types of countries or regions based on economic profiles. The first is composed of regions that have capital/ service/information-based economies (CSI countries); these consist mostly of what typically have been called 'developed' nations. The second includes those with economies based primarily on labour and natural resources (LNR countries). These countries typically derive much of their gross national product (GNP) from export of natural resources and

@CAB International 2002. Macrocyclic Lactones in Antiparasitic Therapy (eds J. Vercruysse and R.S. Rew)

possess an excess of cheap labour; they are usually termed 'developing' regions.

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