By Jonathan Davies

Africa is set to create the world's largest free-trade zone, which will cover 26 countries and more than 600 million people.

With leaders in Egypt to sign the deal, the Tripartite Free Trade Area (TFTA) is designed to make it easier for some of the countries strongest economies to trade with each other. It targets 26 nations that generate more than half of the continent's economy.

There are currently three free-trade blocks - the Southern African Development Community (Sadc), the East African Community (EAC) and the Common Market for Eastern and Southern Africa (Comesa). But the three will merge together to create a free-trade zone covering the continent.

The signing in Egypt is only the first step and it will require Parliamentary approval from individual governments.