Table 3 The following table shows the private value, private cost, and social value for a market with a positive externality. Quantity Private Value Private Cost Social Value 27 6 34 2 24 10 31 3 21 14 28 4 18 18 25 5 15 22 22 6 12 26 19 Refer to Table 3. How large would a subsidy need to be in this market to move the market from the equilibrium level of output to the socially-optimal level of output