deletions | additions       diff --git a/Social_costs_socially_optimal_level__.md b/Social_costs_socially_optimal_level__.md  index 360f2ee..30111b4 100644  --- a/Social_costs_socially_optimal_level__.md  +++ b/Social_costs_socially_optimal_level__.md 
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eg. do the costs of noisy students outweigh the displeasure of the silence-loving librarian? What does this mean for astrophysics?    Now there is debate between the economist and the politics lecturer about slippery slopes versus graphs (personally I'm silent here).