What it means
Every transaction assumes both parties understand what is changing hands, and in practice they almost never do to the same degree. The founder knows why a customer left, the borrower knows how shaky next quarter looks, and the job candidate knows how they actually performed in their last role.
This matters commercially because information gaps make the uninformed party cautious, and caution shows up as a discount or a refusal. If buyers cannot tell a well-maintained van from a neglected one, they bid an average price, which pushes owners of good vans out of the market and leaves a pool weighted towards the poor ones.
The two classic consequences have names worth knowing. Adverse selection happens before a deal, when the worst risks are the keenest to sign; moral hazard happens afterwards, when someone changes their behaviour because they no longer carry the full consequences of it.
A large amount of financial infrastructure is built purely to close these gaps. Audited accounts, credit ratings, warranties and indemnities, escrow arrangements, stock exchange disclosure rules and collateral requirements all exist so the better-informed side can prove what it is claiming.
The informed party can also close the gap deliberately, which economists call signalling. A founder who puts personal savings in alongside outside investors, or a manufacturer offering a five-year warranty, is spending real money to demonstrate a confidence that words alone cannot convey.
The practical lesson for managers is to assume the other side knows something you do not, then decide what it would cost to find out. Sometimes a $40,000 due diligence exercise on a $4,000,000 acquisition is the cheapest insurance available, and sometimes a well-drafted clawback clause achieves the same protection for almost nothing.
In practice
Real-world examples.
Example
A bank reviewing a loan application knows far less about the applicant's prospects than the applicant does. It responds by demanding audited accounts, personal guarantees and a debenture over assets, because each of those either reveals information or makes the borrower share the downside.
Example
A health insurer prices a policy without knowing who is quietly unwell and who is genuinely fit. People who expect to claim are the most motivated to buy, so the insurer uses medical questionnaires, waiting periods and pooled employer schemes to stop the sick applicants from dominating the pool.
Example
A company selling a subsidiary knows about a disputed customer contract that the buyer has not found. The sale agreement handles it with a specific indemnity, so if the dispute crystallises the seller pays, which lets the buyer keep its price rather than discounting for the unknown.
Think of it
“Asymmetric information is when one side knows more than the other-an uneven information playing field.
Case study
Seen in the real world.
This is an illustrative, entirely fictional example. Halloway Instruments agreed to buy Redgate Sensors for $6,000,000 on the strength of three years of accounts and a management presentation. The seller knew, and did not mention, that its largest customer, worth 34% of revenue, had already given informal notice that it would insource production the following year.
The buyer's advisers insisted on a customer verification exercise as part of due diligence, at a cost of roughly $45,000. Two calls into that exercise the plan surfaced, and the deal was renegotiated to $4,200,000 with a further $800,000 held back and payable only if that customer was still trading with the business eighteen months later.
The fictional moral is not that the seller was dishonest, since nothing had been signed and nothing was formally disclosed to them either. It is that the buyer spent $45,000 to close an information gap worth $1,800,000, which is the calculation every acquirer, lender and insurer is really performing.
Watch out
Common mistakes.
- Assuming asymmetric information only applies to fraud, when the far more common case is one party simply having more context, history and detail than the other.
- Believing more paperwork automatically fixes the problem, when a 200-page data room can hide the important issue just as effectively as it reveals it.
- Forgetting that the gap can run the other way, so a large corporate buyer often knows more about market pricing than the founder selling to it.
Questions
People also ask.
Is asymmetric information always bad?
No, because private information is often the legitimate reward for research or experience, and markets would function poorly if nobody had any reason to investigate anything.
How does due diligence actually help?
It converts private information into shared information before the price is fixed, and anything still unknown gets handled by warranties, indemnities or deferred consideration.
What is the difference between adverse selection and moral hazard?
Adverse selection is about who chooses to enter a deal, while moral hazard is about how people behave once they are inside one.
From the founder's library
Take it further with the book.
Build your financial confidence beyond this definition. Shihan's full-length guide, Accounting Fundamentals, takes the same plain-English approach and turns it into a complete, practical playbook for non-finance managers, business owners and students - with chapter-end quiz answers and presentation slides included.
25% off with code MMHQ25, applied at checkout. Priced in USD - checkout may show the equivalent in your local currency.
View the book and save 25%Related