This model illustrates the best investment time point
for CSR under the subjective utility function. Variable
0( )t V is the total value at the waiting stage, including the
operating cash flows and the potential strategy value of
investing in CSR. Variable t
is the operating revenues at
any time point. Variable 1( )t V represents the total value
at the entering stage, including the operating cash flows
and the utility U( E[ * ] ). In addition, the risk coefficients
(discounted rates) at the waiting stage and entering stage
are 0 r and 1 r respectively. Since investing in CSR will
raise the operating cost, we assume that 1 0 r r , which
accords with the relationship between return and risk.