A.規(guī)模效應(yīng)和收入效應(yīng)B.替代效應(yīng)和收入效應(yīng)C.規(guī)模效應(yīng)和替代效應(yīng)D.替代效應(yīng)和平移效應(yīng)
A.Ed=+∞B.Ed=-∞C.Ed=0D.Ed=1