This paper examines the UK FT30 stock index during the Second World War period 1939-1945 for weak form efficiency, showing that there is substantial structure in the data, albeit in two distinct subsets. Fitting a GARCH (p, q) model to each data subset yields R -2 values of around 19%; clear...

The behaviour of the Sterling/European Currency Unit (ECU) exchange rate is examined both during the time before Britain joined the European exchange rate mechanism (ERM) and during the time of Britain's membership. During the latter period, a GARCH (1, 1) model fits the data well but during the...