it is clearly defined. every exchange has rules in writing on their website. its up to the trader to know what the rules are. 60% threshold was very generous.Quote from neutrino:
Well, if it is a misprint - clearly notBut as I said - there must be rules before the fact, not after. Because next time Dell gets scared that a competitor is going to offer ultra cheap laptops in the next few months, and Dell wants to offer their merchandise for 60% off - nobody will dare buy anything causing huge inventory problems for Dell.
BTW I am not against a 60% bust rule if it is clearly defined - but not for past trades!
here is an example:
http://www.nyse.com/pdfs/CEE_Policies_Email_Submission_Guidelines.pdf
Numerical Guidelines
Under the new Numerical Guidelines, an execution may be found to be clearly erroneous only if the price of the transaction to buy is greater, or less in the case of a sale, then the reference price by an amount that equals or exceeds the numerical guidelines for a particular transaction category. (A mistake in entering an order or a quote, or that the firm failed to pay attention to or update a quote, may not be sufficient to determine that a transaction was clearly erroneous.)
The Exchanges will generally use the consolidated last sale as the Reference Price to determine whether an execution is clearly erroneous. The execution time of the transaction under review determines which Numerical Guideline is applied. The chart below outlines the details.
The Numerical Guidelines are as follows:
Reference Price: Consolidated Last Sale
Regular Trading Hours of the Exchange Numerical Guidelines (Subject transactionâs % difference from the Consolidated Last Sale):
After Hours of the Exchange Numerical Guidelines (Subject transactionâs % difference from the Consolidated Last Sale):
Greater than $0.00 up to and including $25.00
10%
20%
Greater than $25.00 up to and including $50.00
5%
10%
Greater than $50.00
3%
6%
Multi-Stock Event â Filings involving five or more securities by the same ETP Holder will be aggregated into a single filing
10%
10%
Leveraged ETF/ETN securities
Regular Trading Hours of the Exchange Numerical Guidelines multiplied by the leverage multiplier (e.g. 2x)
After Hours of the Exchange Numerical Guidelines multiplied by the leverage multiplier (e.g. 2x)
But as I said - there must be rules before the fact, not after. Because next time Dell gets scared that a competitor is going to offer ultra cheap laptops in the next few months, and Dell wants to offer their merchandise for 60% off - nobody will dare buy anything causing huge inventory problems for Dell.