more/greater than the sum of its parts › more powerful, effective, etc. as a whole than you would think if you considered the different features or parts that it consists of: The claimed logic of this latest merger is that the whole will be more than the sum of the parts.
a princely/tidy sum › a large amount of money: She sold her story to the tabloids for a princely sum. We have made a tidy sum on our investments.
the princely sum of sth › used in a humorous way to refer to an unexpectedly small amount of money: The book was first published in the UK in 1972 for the princely sum of 40p.