Market Research on market size and growth

10x cheaper over 10 years is an annual reduction of about 20%
(1-0.2)10 = 0.107

Or in monthly terms is about a monthly reduction of 1.85%
(1-0.0185)12*10 = 0.106

Accumulating the costs over time (including reductions) eventually approaches 5x the original annual cost, so about 60x the original monthly cost.

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