ROR (Rate of Return)
The return on an investment, usually in present value, after adjustment for inflation. Like ROI, rates of return are usually measured in purely economic terms but can also include the costs and benefits associated with human and natural capital to give an organization a broader and more sustainable understanding of an investment. An evolved definition might be “Rate of Sustained Return” to indicate that the income generated by the investment is sustainable, not just short term gain.
ROR = sum of all returns in value / the number of return periods