Benkyō shimasu (勉強します): literally, we will study. The Daijisen dictionary gives a merchant’s sense of benkyō: to cut the price of goods and sell them cheaply.
Makeru (負ける): literally, to lose. The Daijisen dictionary gives the sense of lowering a price, or adding something as an omake, an extra.
Nasake wa hito no tame narazu (情けは人の為ならず): kindness is not for the other person’s sake. Kindness to others comes back to oneself in the end. The national opinion survey on the Japanese language for fiscal 2010 found that fewer than half of respondents understood the proverb in this original sense.