Which is more expensive - Your smile or your anger?

Do you get angry? If so, how often?

I can but it's very expensive....

Usually, we can give our anger freely and smile rarely as though a smile is costly.

In ignorance, anger is cheaper and a smile is costly.

In Knowledge, a smile is free like sun, air, and water and anger is extremely expensive like a diamond.

And in my view we have to make our Smile cheaper and anger expensive. And my Anger is too expensive..!!(I mean in other way .. :) ). But trying to reduce my anger and want to be free like wind.