The theory, developed by the economist John Muth, that economic transactors make unbiased forecasts on the basis of all the information available. They thus do not make systematic forecasting errors.

• exercise premium
• exercise price
• ex gratia
• ex growth
• exhaust price
• Eximbank
• exit
• exit bond
• exit charge
• exit value
• ex-new
• exotic options
• exotics
• expectations hypothesis
• expected credit loss
• expected return
• expected tail losses
• expected value
• expected volatility
• expenditure tax
• expense account
• expiration cycle
• expiry cycle
• expiry date
• exploding option