Fast Market Rule
In the United Kingdom, the exchange may determine that a market movement is so sharp that quotes cannot practically be kept current. Under the Fast Market Rule, market makers may be permitted to trade outside quoted ranges where updating quotes is deemed impractical.

Investopedia Says:
This rule is made possible because circuit breakers are not used.

Related Terms:
Circuit Breaker
Fast Market
Market Maker
Market Maker Spread
Quote
Volatility

• Consumer Confidence Index (CCI)
• Consumer Credit
• Consumer Cyclicals
• Consumer Internet Barometer
• Consumer Packaged Goods (CPG)
• Consumer Packaged Goods (CPG)
• Consumer Price Index (CPI)
• Consumer Price Index (CPI)
• Consumer Staples
• Consumer Surplus
• Consumption Capital Asset Pricing Model (CCAPM)
• Consumption Capital Asset Pricing Model (CCAPM)
• Consumption Function
• Contagion
• Contango
• Contestable Market Theory
• Continentals
• Contingency
• Contingency Order
• Contingent Asset
• Contingent Beneficiary
• Contingent Convertibles (CoCos)
• Contingent Convertibles (CoCos)
• Contingent Deferred Sales Charge (CDSC)
• Contingent Deferred Sales Charge (CDSC)