Barter System.

Do you know Barter system.In ancient time when there was no concept of money.People exchange items with each other which is called barter system.This was very confusing system because valuation was big problem in this respect.For example some one have horse and was interested to exchange this with grocery stuff like sugar,pulses,milk etc so this was a very time consuming and problematic job to find a person who posses these items and have a need of horse too.If he succeed to find a man with this things the next problem was that how to valuate these things for exchange. I think people are now very lucky that they have money in their hand which is ready for buying any thing any where any time......