On November 17, 1988, the board of directors of Nestle AG decided to a
llow foreign investors to hold Nestle registered stock, reversing a lo
ngstanding practice. This decision had a tremendous impact on the pric
es of the firm's three classes of common stock, as well as on the pric
es of several other corporations traded on the Zurich stock exchange.
These price changes can be explained by the hypothesis that demand cur
ves slope down.