Use the following figure to answer the question : Figure 20-2 : shows the competitive supply curve of a commodity is given by S1,the private marginal benefit curve is D1,the marginal social benefit curve is D2,and the MBE curve reflects the marginal external benefits. 
-In Figure 20-2,the price level when the efficient output is being produced is _____ than the price level when the market equilibrium output is being produced by _____.
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