How did people perchased any thing when there was no any type of currency....

We all want to make our self successfull because there is problum of incom . Yes iam right every body have alot of wants but they have common problums of money . There are 3 types of money
Coins (like deenar)
Paper currency.

Crypto currency. Digital currenciy.
Many peoples dont know about crypto new young generation currency.
When there was no currency then how did they perchased any thing?
Yes it is a question . When I thaught that how people perchased when there was no any type of currency . Then I read a book which write that when there was no currency then peoples are very hard workers they did changed their things to others . One person had rice and second had vegitable so 1rst did exchange with second. After some senturies deenar was released for perchasing. After some time paper money take place of deenar the gold coin. And it is very great thing for perchasing . Now its time to cryptocurrency abd paper currency too.
Crypto give us new world and it has many type ofcurrencies and coins like bit coin and steem . Iam using steemit as a earning platform .
I hope it will be complete currency after some years and it will take place ofpaper money.
Thanks to read .
I hope its a very knowledge full article.