True / False With Explanations:

1. The slope of an isocost line defined over two inputs is the negative of the factor price ratio.
2. In the short run firms produce only if they can cover their variable costs and fixed avoidable costs.
3. The lower the interest rate the lower the bond price.
4. If each of 500 firms has an identical marginal cost curves of MC = Q the market supply curve is P = Q/500.
5. The deadweight loss from a price floor is the same as that of a production quota at the same level of output.
6. Two part tariffs always involve setting the price per unit above marginal cost.