Why is trade necessary explain with example

Trade is necessary mostly for resources and supplies/goods that you don't have but need.

100% Real Example: Water is trade for platinum in Zimbabwe, South Africa

For example: Foods with nutrients that your body need to keep you healthy

Another Trade Necessary Example: (Sodium) foods

Explanation:

the reason the welfare system causes so much of a burden on its recipients is because the welfare system does not give its recipients any real tools to actually get out of poverty. the welfare system has embedded poverty deeper into society and has made it harder and harder for people to escape poverty.

in other words, it stoped the poor, and now its making it worse.

hope this . : )      

and im sorry it took so long for your question to get answered

where is your diagram?