is his theory propose that, memory fades because of the passage of time. Information is not available for later retrieval as time goes by and memory, as well as memory strength, wears away. When an individual has a new knowledge, a neurochemical "memory trace" is created. However, as time goes on, this trace slowly disintegrates. Continually practicing information is believed to be a major factor counteracting this temporal decline
It was first introduced in the first Lomé Convention (1975) with the purpose of remedying the harmful effects of the instability in export revenue from agricultural products.