The Quran says no amount of interest is good for society, but trade is.
2:275 On the contrary, those who eat Riba (usury), in greed of money, run around like someone who has been bitten by a snake. They claim that trade is like usury. But God has permitted trade and forbidden usury. One to whom the clear Admonition has come from his Lord, must abstain from taking usury forthwith. What he has taken in the past, he may keep and his judgment rests with God. As for him who returns to usury, such are the dwellers of the fire wherein they shall abide.
[Ash-shayitaanu-min-al-muss = Satan by his touch = Snake by its bite. Satan has been described as serpent in many texts. One who has taken usury in the past, it is better for him to return the interest he has earned, but the law shall not force him to do so. Trade is the return on labor that is permissible, while usury is the return on money and therefore, forbidden. 30:39, 53:39]
2:276 God blights usury and blesses charitable deeds with prosperity. God does not love those who defy His laws and drag down the potential of the human society.
From a desi Qurani, unadulterated and pure.