remainder of society. Water contamination from plants and industrial facilities is another model. All customers are completely exacerbated off by contamination however are not repaid by the market for this harm. A positive externalitv is the point at which a singular's utilization in a market builds the prosperity of others, yet the individual doesn't charge the outsider for the advantage. The outsider is basically getting a free item? An illustration of this may be the condo over a pastry shop getting the advantage of delightfrom smelling new baked goods each day. Individuals who live in the condo don't remunerate the pastry kitchen for this advantage. [1]