river bed (river beds plural) , riverbed A river bed is the ground which a river flows over. n-count. up-river, upriver. Something that is moving up-river is moving towards the source of a river, from a point down the river.
In economics, the term trade-off is often expressed as an opportunity cost, which is the most preferred possible alternative. A trade-off involves a sacrifice that must be made to get a certain product or experience. A person gives up the opportunity to buy 'good B,' because they want to buy 'good A' instead.
An economic arrangement between different regions marked by the reduction or elimination of trade barriers and the coordination of monetary and fiscal policies.here are varying levels of economic integration, including preferential trade agreements (PTA), free trade areas (FTA), customs unions, common markets and economic and monetary unions.