Fast, Cheap and Good

When buying any service, you can have two of the above three. You will almost never get all three: Cheap, Good and Fast.

 

If it's cheap and good, it won't be fast;

If it's fast and good, it won't be cheap;

If it's cheap and fast, it won't be good;

 

If someone offers you all there, do remember to say "Thank you Santa Claus".