One common advantage of a long-term investment is

higher return.
lower risk.
higher liquidity.
lower liquidity

The answer is higher return.

One common advantage of a long-term investment is higher return.

Explanation: Long-term investment refers to investment instrument such as bonds, stocks, real estate and so on that matures after many years. Long-term investment are also assets that can be held for more than a year. Long-term investors encounter series of risk in pursuit of higher returns or reward.

Higher return means gain generated from an investment over a period of time.

there is an explationation of this on a site called crash   course world history 1

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