user129: In the Bitcoin mining profitability calculator at bitcoinx.com/profit, there is a field with the description "Profitability decline per year". What does this field mean in regard to the calculation?
At a guess, I'd say, if it's set to 0.01 the projected income for a year from now will be 1% of today's projected income.

user13700: I agree that it isn't worded very well. It seems to be a number r such that the revenue n years from now will be r^n times the revenue today, so basically what you said.
To empirically verify this, set electricity and hardware cost to 0 (so that profits equal revenue), time frame in months to 12 (for a full year), and profitability decline to 1. You should get $1,366 or so. If you change it to 24 months, you get $2,732 - exactly double the previous. On the other hand, with a profitability decline of 0.2, you get $679 in 12 months and $814 in 24 months, which is $135 (or 20%) more.

129: <p>In the Bitcoin mining profitability calculator at <a href="http://www.bitcoinx.com/profit/" rel="nofollow">bitcoinx.com/profit</a>, there is a field with the description "Profitability decline per year". What does this field mean in regard to the calculation?</p>

<p>At a guess, I'd say, if it's set to 0.01 the projected income for a year from now will be 1% of today's projected income.</p>
 13700: <p>I agree that it isn't worded very well. It seems to be a number <code>r</code> such that the revenue <code>n</code> years from now will be <code>r^n</code> times the revenue today, so basically what you said.</p>

<p>To empirically verify this, set electricity and hardware cost to 0 (so that profits equal revenue), time frame in months to 12 (for a full year), and profitability decline to 1. You should get $1,366 or so. If you change it to 24 months, you get $2,732 - exactly double the previous. On the other hand, with a profitability decline of 0.2, you get $679 in 12 months and $814 in 24 months, which is $135 (or 20%) more.</p>
