I had a comment from Peter Ahl (of Serenata Flowers in the UK) about my 90/10 post below that pretty much summed up what there is to say about the 90/10 rule in a few sentences that we all should have learned in Econ 101.
I wanted to include it because it puts the issue so succintly and well:
"In Economics we learn about the relationship between capital (read: tool) and productivity. Applying more capital increases labour productivity. Applying better tools (capital/technology) in your Customer Service department for example makes the staff more productive, and it works up to a point. The percentage spend on technology/capital/tools vs. staff labour cost will vary in each industry, business and over points in time."
That seems to me to be pretty much all there is to say...

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