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I think the SP rate should exceed 51%

How so?

Total number of Steem Power / Number of Circulating Supply Steem: 51%

I get 39.4%.

perl -e 'print 167834612.804 / 425672395.706 . "\n";'
0.394281176080581

I don't think it's a good rate. If we make this rate 51%, both the amount of steem on the exchanges will decrease and the network will be more reliable.

Oh, now I understand. Thank you for the clarification.