What do you mean by check and balance?

Checks and balances is a principle of government under which separate branches are empowered to prevent actions by other branches and are induced to share power. Checks and Balances are meant to keep power distributed rather than having one area of government holding too much power.

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for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.