Since childhood we hear, As shall we sow, so shall we reap.
This means whatever we will grow we will get its fruits.
If we will do good we will get an excellent result and if we do cruel deeds we will get a dreadful result.
I really believe in this Karma law, if we get birth in a well to do family we are believed to have done something good in the previous life if it was any or else why not all kids are born in well to do families.
So, What's your idea of Karma?