How Historical London Privileges Relate to European Calls
Summary
The discussion compares a historical “London Privilege” call definition with modern European and American calls. The quoted historical wording says a holder seeking to lock in a profit before maturity must trade in the open market and balance the position at settlement, rather than settle the option early. The answer interprets this as making offsetting trades to close or hedge the position.
On that reading, the privilege has European-style exercise: it does not grant early settlement, even though the holder could trade to offset exposure before maturity. The response says this is effectively a European option and explains that offsetting trades are often more attractive than early exercise, so American options are often priced close to European ones. This is a brief historical interpretation, not a formal derivation or a general pricing rule; the excerpt alone does not establish how every contract using the old term was structured.
Key ideas
- The historical wording describes trading to offset a profitable position before maturity rather than early settlement.
- The answer interprets the London Privilege as having European-style exercise.
- Offsetting trades can let an option holder manage exposure without exercising early.
- The response says American options are often priced similarly to European options because early exercise is rarely advantageous.
- The conclusion is an interpretation of the cited passage, not a full contract or pricing analysis.
Tags
Full text
# Is the older London Call (privilege), different from European Call? # Is the older London Call (privilege), different from European Call? In another discussion the user zer0hedge provides an excerpt from definitions of CALL from a book of 1904 from S.A.Nelson which contains the following: ... and before its maturity if it shows you a profit, you are obliged to trade in the open market and then balance the operation on settlement day" ... This makes it similar to American Call in one aspect, but a bit worse (the "obliged" part), whereas recent reading of definitions of European Call, do not include neither the "before", nor the "obliged" part. If they are different (older London Call vs more recent European Call), how does their price compare to American Call? (I'd assume the "before" should increase the value, but the obliged should have a moderation effect). ## Answer by D Stanley (score 2) https://quant.stackexchange.com/a/85836 In that context, I believe he is saying that if you wanted to lock in profits, then you cannot settle the option early, but can make additional trades (i.e. sell an equivalent option to someone else) to lock in profits and offset your position. So "obliged to trade in the open market" means you must make offsetting trades rather than being able to settle the option early. In reality, trading to offset your position is almost always more profitable than settling early, which is why American options are very rarely exercised early and are priced very similarly to European options. His description of a "London Privilege" is exactly equal to a European option, but the European/American terminology was not introduced until much later.
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