... Take, for example, the abrupt halving of the reward every 4 years: it is a source of instability and uncertainty, the 2016 halving is already having people worried now.  Why didn't he specify a more gradual decrease, that would give the same 0.5 factor in 4 years but in small monthly steps? The only reason I can think of is that it would have required another page or two of source code, and a table of 48 steps, properly rounded, and another paragraph in the white paper...