What is SEI !
создатель Shaurav Neupane
1. Economic
1.1. - Wants
1.1.1. ex, Iphone
1.2. - Needs
1.2.1. ex, Food, water
1.3. - Goods
1.3.1. ex, laptop
1.4. - Sevices
1.4.1. ex, taxi ride
1.1.1. ex, Iphone
1.2.1. ex, Food, water
1.3.1. ex, laptop
1.4.1. ex, taxi ride