This article showed one:
I believe envisioning, imagining and balance sheet reading/interpretation plays a huge role. e.g. SKF and FAG - two bearing companies, same amount invested at the same time may have very different results. Competent technology with both. But profitability can be hugely different.
At the time of investment, I looked at only engineering capability and world class standing of products. I could not envision or interpret co-relationship between labour costs of production and related profitability.
AK