Both types of IUDs work primarily by preventing sperm from fertilizing an egg. The copper IUD releases copper into the uterus, which works as a spermicide. The others release a form of the hormone progestin into the uterus. The progestin thickens the cervical mucus so that sperm can't reach the egg.
Commercial agriculture. Commercial agriculture is a large-scale production of crops for sale, intended for widespread distribution to wholesalers or retail outlets. In commercial farming crops such as wheat, maize, tea, coffee, sugarcane, cashew, rubber, banana, cotton are harvested and sold in the world markets.
Readers question: What is a âdual economyâ? A dual economy refers to the existence of two distinct types of economic segments within an economy. This involves: A capitalist based manufacturing sector (geared towards global markets) Labour intensive agricultural sector (low productivity, geared towards subsistence farming or local markets) The British economist W. Arthur Lewis wrote an influential paper on the âdual economyâ in 1954.