A diversified economy is an economy that has a number of different revenue streams and provides nations with the ability for sustainable growth because there is not a reliance on one particular type...
Lightning can strike rubber although it is not a good conductor of electricity.
Rubber is a good conductor if heat but a bad conductor if electricity. Diamond will do the first two IIRC, but its intrinsic strength is much higher than stainless steel. However its failure modes are very different, so comparing the two is a bit thankless.... mika.