The following diagram shows the demand for sterling by holders of dollars (e.g. to buy UK imports) and the supply of sterling to purchase dollars (e.g. to buy US exports). The sterling demand and supply curves are currently
D0 and
S0 and the
exchange rate is currently £1 = $1.30.

Now assume that speculators on both sides of the Atlantic believe that the pound is undervalued. What would happen to the exchange rate assuming that one of the demand and supply curves, or both curves, shift to one of the other positions shown in the diagram.
◦ Fall to $1.10
◦ Fall to $1.20
◦ Rise to $1.40
◦ Rise to $1.50