This paper presents a contingent-claims approach to project valuation
when capital expenditures are made sequentially over time. It focuses
on an important facet of sequential investment projects that the firm
can undertake-or pass up projects-as mote information becomes availabl
e. The contingent-claims approach takes account of this important feat
ure of firms' investment decision process, whereas the traditional cap
ital budgeting procedure does not. Since the traditional method does n
ot reflect the options nature of investment opportunities, it underest
imates the value of sequential investment projects. As a result, a nai
ve implementation of the traditional capital budgeting procedure could
result in rejecting profitable projects. The extent of undervaluation
associated with the traditional capital budgeting procedure is greate
r when the correlation between the random component of the future asse
t value and that of the required capital expenditure is smaller and/or
when the growth rate of the required capital expenditure is higher.