Echo gains
From Fallen London Wiki
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-12.5+12.5+230*0.01+9.5*0.02+5.5*0.1+0.5*0.2+3.5*0.5+1.5*2.5=8.64 If the price of '79, '82, '72 and '68 is 0.02, 0.04, 0.2, 2, that is -12.5+12.5+230*0.02+9.5*0.04+5.5*0.2+0.5*2+3.5*0.5+1.5*2.5=12.58.
