This raises two serious worries about prioritarianism. The first concerns prioritarianism’s difficulty in nonarbitrarily determining how much more importance to give to the welfare of the worse off. For example, should a unit of benefit to the worst off count 10 times the same size benefit to the best off and 5 times the same size benefit to the averagely well off? Or should the multipliers be 20 and 10, or 4 and 2? The second worry about prioritarianism is whether attaching greater importance to increases in welfare for some than to the same size increases in welfare for others contradicts fundamental impartiality (Hooker 2000: 60–2).