Devaluation of currency is a cautious move by the government of a country to decreasingly adjust the value of its currency.
China as a country is dominating the world market and economy because of that bold move.Because of the massive industrialization in china couple with the large productive population, capital intensive production and most importantly good maintenance of the nation resources.
Since china is one the most exporting countries in the world, china devalue the Chinese yuan which made imports expensive and export cheap.
Chinese taste for foreign good reduces, infant industries in china are protected, china has a surplus balance of payments which lead to economic growth and development.
But what is happening in most developing countries especially In Africa is not devaluation of currency but rather depreciation of currency.which is cause by low level of industrialization Imports based economy.
There is a fairly simple and, importantly, logical explanation of why an acceptable currency devaluation is the engine of the economy and a "competitive" advantage. And now, in order:
1. Devaluation as the driving force of the domestic economy. Tu is simple enough. If the local currency is deprived of such a property as devaluation, i.e. a gradual reduction in price, or loss of value, the population, with a high probability, will simply accumulate and block significant amounts "in wallets". This means that these amounts (this can be a really significant amount for the local economy) will be "withdrawn" from circulation, which means that the money turnover within the country will decrease, and what is important - the investment attractiveness of money will disappear. This means that instead of investing (and buying goods, services, real estate, cars, etc. is, in a sense, investing in domestic producers), they will engage in ineffective "accumulation".
2. Devaluation as an exchange rate gain for the exporter. Very high cost, and growing (without devaluation) makes the export product less competitive. The same China is devaluing its currency for a reason. The consequence of the devaluation is the stimulation of exports, since the exporter, when exchanging the earned foreign currency for his depreciated currency, receives a devaluation income.
BUT ! There are many nuances that can give a purely negative result from inflation / devaluation (similar processes)