What is the contemporary English proverb for 'Throw in a sprat to catch a salmon'
Solution 1:
"You have to spend money to make money." (about business strategy)
"Gotta burn trees to earn degrees." (about school paperwork)
"There's no such thing as a free lunch." (is a popular adage communicating the idea that it is impossible to get something for nothing)
"Strings attached" (means there is the expectation of reciprocity)