Increased international financial integration is likely to cause greater ma
rket interdependence. This may either reduce volatility or increase it, by
adding a new source of noise. Based on Swedish data, the findings in this p
aper are that foreign influence on the stock market shows a clear, positive
trend, while purely domestic factors have not become more volatile. The tr
endwise increase in volatility on the Swedish stock market can thus be attr
ibuted to increased foreign influence.