A fixed increase means the slope is decreasing. For example,
Code:perl -e 'use warnings; use strict; my $curPrice = 100; my $incr = 2; for (my $i = 1; $i <= 10; ++$i) { my $slope = $incr / $curPrice; my $nextPrice = $curPrice + $incr; print "i $i curPrice $curPrice incr $incr slope $slope nextPrice $nextPrice\n"; $curPrice = $nextPrice; }'
Result:
i 1 curPrice 100 incr 2 slope 0.02 nextPrice 102
i 2 curPrice 102 incr 2 slope 0.0196078431372549 nextPrice 104
i 3 curPrice 104 incr 2 slope 0.0192307692307692 nextPrice 106
i 4 curPrice 106 incr 2 slope 0.0188679245283019 nextPrice 108
i 5 curPrice 108 incr 2 slope 0.0185185185185185 nextPrice 110
i 6 curPrice 110 incr 2 slope 0.0181818181818182 nextPrice 112
i 7 curPrice 112 incr 2 slope 0.0178571428571429 nextPrice 114
i 8 curPrice 114 incr 2 slope 0.0175438596491228 nextPrice 116
i 9 curPrice 116 incr 2 slope 0.0172413793103448 nextPrice 118
i 10 curPrice 118 incr 2 slope 0.0169491525423729 nextPrice 120
I am sorry, I cannot understand your code?