The investment-banking business has split in two, with two main strategies that banks can choose from to deliver returns for shareholders. Banks can employ a scale strategy, in which they are big enough and in enough business lines that they become key to clients and are able to generate attractive returns. JPMorgan fits the bill here. Or they can be a niche player, picking their spots in particular business lines in which they have a competitive strength. The Swiss bank UBS has had success with this strategy, and "doing a UBS" is now shorthand for slimming down in investment banking. Some banks, however, are stuck between those strategies. The middle ground, where banks have the cost base of a scale player and the revenues of a niche firm, has come to be known on Wall Street as the "Valley of Death," or "the Killing Fields." Basically, you don't want to be there. Macquarie analysts led by Piers Brown touched on this in a big note out Friday and said that as many as eight firms find themselves in a dreaded "mid-tier" position. The note said: We think many banks have simply not been selective enough and find them caught in unprofitable mid-tier positions across multiple product segments with balance sheets 30-40% smaller than scale peers but 2-3x larger than successful niche players. This applies to most European banks except UBS, as well as to MS and BAC amongst US peers. The note added that further restructuring looks inevitable for the banks in the middle-tier group, a group that includes Credit Suisse and Deutsche Bank, which have already announced measures to slim down, as well as Bank of America and Morgan Stanley. "For this group of banks we estimate cost bases are probably at least 20-40% too high unless there is a sizeable improvement in the revenue environment," the note said. Expect more job cuts, in other words. [Screen Shot 2016 06 14 at 9.00.33 AM] SEE ALSO: IEX CHIEF: STOCK EXCHANGES ARE OVERCHARGING INVESTORS BY BILLIONS OF DOLLARS Join the conversation about this story » NOW WATCH: FORMER GREEK FINANCE MINISTER: How I dealt with stress when Greece nearly defaulted