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What does park means here? thanks

Follow the money. Who’s receiving these interest payments? Mostly Americans, not foreigners. And most of these Americans are wealthy investors who park their savings in treasury bonds held by mutual funds,

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To park money means to place it in a relatively safe investment. Very often, in volatile economic times people park money in government bonds until things calm down and it appears relatively safe to invest. Also, if a person has excess funds, that money will get parked in a safe investment that does not earn much, because there is no need for higher earnings.