Most finance textbooks teach the impact of options in three different
possible scenarios: a portfolio with stocks only, a portfolio with
options only, or a portfolio with options equal to the number of stocks
that would equal the number of shares under the stock-only portfolio
and investing the rest in risk-free asset. Bodie et al. (2009) argue that a
portfolio with call options and Treasury bills (T-bills) would produce
the lowest level of risk because the most an investor would lose is the
option premiums. This argument, however, is incomplete. If all investors
are rational, they would not purchase the underlying asset and thus
making the asset worthless. A stock that is worthless has no option contract,
and the investors would be investing in T-bills only. A portfolio
with options only is the riskiest portfolio.
are rational, they would not purchase the underlying asset and thus
making the asset worthless. A stock that is worthless has no option contract,
and the investors would be investing in T-bills only. A portfolio
with options only is the riskiest portfolio.
Most finance textbooks teach the impact of options in three different
possible scenarios: a portfolio with stocks only, a portfolio with
options only, or a portfolio with options equal to the number of stocks
that would equal the number of shares under the stock-only portfolio
and investing the rest in risk-free asset. Bodie et al. (2009) argue that a
portfolio with call options and Treasury bills (T-bills) would produce
the lowest level of risk because the most an investor would lose is the
option premiums. This argument, however, is incomplete. If all investors
are rational, they would not purchase the underlying asset and thus
making the asset worthless. A stock that is worthless has no option contract,
and the investors would be investing in T-bills only. A portfolio
with options only is the riskiest portfolio.
are rational, they would not purchase the underlying asset and thus
making the asset worthless. A stock that is worthless has no option contract,
and the investors would be investing in T-bills only. A portfolio
with options only is the riskiest portfolio.
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