Amdahl's Law is basically the Law of Diminishing Returns,

which applies to investments as well as computer

architecture. Here is an example that helps explain the law$-$

Your brother has joined a start$-$up and is trying to convince

you to invest some of your savings, since, he claims, "it's a

sure thing!"

You decide to invest $10\%$ of your savings. What must be the

return on your investment in the start$-$up to double your

overall wealth, assuming the start$-$up was your only

investment?