How Are Investment Banks Different From Commercial//Common Banks? (in the way they function & perform basic tasks)! (#87)
How Are Investment Banks Different From Commercial Banks?
Both are "banks," so it's an easy mix-up — but investment banks and commercial banks function quite differently. We've covered each individually before; today, let's put them side by side.
→ Related: What Are Investment Banks?(#73), How Do Banks Work?(#72)**
What Do They Actually Do?
Investment Banks help businesses raise capital by connecting them with investors — acting as a guaranteeing intermediary in the process (a function called underwriting). They're also heavily involved in mergers and acquisitions, advising companies on buying, selling, or merging with other businesses.
Commercial Banks (the kind most of us interact with daily) issue loans, handle everyday transactions like transfers, and collect deposits — paying depositors a portion of interest in return for holding their money.
Who Benefits, and How?
Investment banks primarily serve businesses and investors directly — helping the former raise capital and the latter find investment opportunities.
Commercial banks serve the general public more broadly — enabling everyday transactions and providing a place to safely deposit and grow savings through interest.
How Do They Each Make Money?
Investment banks earn substantial fees for successfully completing a deal — a reflection of both their role as the deal's guarantor and the real risk they take on in that position.
Commercial banks earn primarily through the spread between what they charge borrowers on loans and what they pay depositors in interest — lending out deposited funds at a higher rate than they pay the depositors themselves.
→ Related: How Do Banks Work?(#72) — covers this mechanism (fractional reserve banking) in more depth.
How Much Risk Does Each One Take On?
Investment banks take on considerable risk, given their role guaranteeing deals between buyers and sellers — if either side fails to deliver, the investment bank is on the hook.
→ Related: What Are Investment Banks?(#73) — for the full breakdown of how this risk plays out.
Investment banks are typically privately owned companies. Commercial banks, meanwhile, are also mostly privately owned in most countries — worth correcting a common misconception here: they aren't generally "government-backed" in the sense of being government-owned. What actually protects depositors at a commercial bank is deposit insurance (like the FDIC in the U.S. or the DICGC in India), which guarantees deposits up to a certain limit if a bank fails — regardless of who owns it.
→ Related: What Are Shadow Banks?(#78) — covers this same deposit insurance clarification in more depth.
That covers the core differences between investment banks and commercial banks — what they do, who they serve, how they earn, and the risk each one carries. Thanks for reading.

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