Discuss potential explanations for the increase in median ROIC and the widening of the distribution of ROICs

Question:

Discuss potential explanations for the increase in median ROIC and the widening of the of ROICs across all companies over recent decades.
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...