Short term investment may turn risky. Following points can
justify this argument:
- Short term capital gains are often taxed differently and are
generally higher than long term capital gains. Which means you
might end up getting lower return actually.
- Many investments fall in short term but grow in long run. Hence
risk of losing capital remains in short term investment.
- Short term investments often include more expenses than long
term investment viz transaction fee, brokerage etc
Long term investment might turn risky in following
situations:
- Opportunity cost is higher in long term investment. Suppose you
have invested in a security paying you a coupon of 8% per annum for
20 years. Suppose during the currency of this investment if federal
rates go up than 8% you will start incurring opportunity loss as
you can't exit from your existing investment. So your investment is
exposed to interest rate risk in long run.
- Potential return of your long term investment portfolio
averages over longer spans. As it sees various ups and downs during
its currency (or tenure)
- Risk of defaulting the payment on maturity by the issuer is
also there in long term investment as the performance of the
company/business might get worse in years to come.