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行動 vs. 不行動の後悔

家族にお金を貸すか断るか

行動した場合

家族や友人にお金を貸す

35%

行動しなかった場合

家族や友人への貸し付けを断る

26%

それぞれの選択を後で後悔した人の割合。バーと完全な記録は下に表示されます。


金融

最終確認 2026-04-25

証拠の質 3.13/5

8次元のレビュー評価。基準は 品質ルーブリック 。各次元は1〜5で評価。

D1 出典の検証
2/5
D2 出典の権威性と独立性
2/5
D3 後悔率の正確性
3/5
D4 出典の比較可能性
2/5
D5 ギロヴィッチ・パターン
3/5
D6 文章の質
5/5
D7 注意事項の完全性
5/5
D8 サンプルの質
3/5
平均 3.13/5
Two hands near each other but not touching, with a small gap between them, on a neutral background.

行動への後悔

家族や友人にお金を貸す

35%

貸し手の24-46%が後悔

家族または友人にお金を貸した米国成人

遡及的、固定期間なし

不作為への後悔

家族や友人への貸し付けを断る

26%

26%が拒否したことで関係が終わったと回答(代替指標 — 注意事項参照)

家族または友人にお金を貸すことを拒否した米国成人

遡及的、固定期間なし

この選択を後悔した割合

action dominates — 行動が優勢 — 多くは行動したことを後悔しています。

関連する決断

意味的に類似する決断 — 同じ領域、異なるトレードオフ。

金融

成人の子どもへの経済支援 vs. 打ち切り

この選択を後悔した割合

行動が優勢

行動の後悔が3.7倍高い

金融

頭金の贈り物 vs. 老後の蓄えを守る

この選択を後悔した割合

不作為が優勢

不作為の後悔が2.3倍高い

金融

家賃交渉

この選択を後悔した割合

不作為が優勢

不作為の後悔が1.9倍高い

金融

相続計画を今 vs. 後回し

この選択を後悔した割合

不作為が優勢

不作為の後悔が11.7倍高い

金融

自宅リフォーム

この選択を後悔した割合

行動が優勢

行動の後悔が2.3倍高い

金融

医療費の交渉

この選択を後悔した割合

不作為が優勢

不作為の後悔が7.6倍高い

金融

ペイデイローンの決断

この選択を後悔した割合

不作為が優勢

不作為の後悔が2.2倍高い

family

老人ホーム vs. 在宅介護

この選択を後悔した割合

行動が優勢

行動の後悔が2.3倍高い

Lending money to family or friends is a decision where both paths carry substantial downside. Bankrate’s 2019 survey of 2,490 US adults found that 46% of those who lent money to a loved one experienced negative consequences — lost money, damaged credit, or harmed relationships. LendingTree’s parallel survey put direct regret at 24%. On the refusal side, 26% of those who declined to lend say the refusal ended a relationship entirely. The action side carries financial risk; the inaction side carries relational risk.

The asymmetry in regret type is more interesting than the asymmetry in regret rate. Lenders who regret the decision typically lost money they will not recover — a concrete, quantifiable harm. Refusers who regret it lost a relationship — an emotional, diffuse harm that may be harder to value but can persist longer. Gilovich and Medvec’s temporal framework would predict that the relational regret (inaction) grows over time while the financial regret (action) fades, but no longitudinal study has tested this specifically for family lending.

The comparison has a fundamental measurement problem: the two sides use different instruments, different survey years, and different definitions of “negative outcome.” The 35% midpoint used for the action side blends direct regret (24%, LendingTree) with broader negative consequences (46%, Bankrate). The 26% for the inaction side measures relationship loss, not self-reported regret. A cleaner comparison would need a single validated instrument applied to both lenders and refusers in the same sample. Until that exists, the takeaway is qualitative: both lending and refusing carry roughly comparable odds of a bad outcome, but the nature of the harm differs.

出典: 行動

根拠台帳

以下の各数値は各出典が報告した内容であり、引用した原文の抜粋と算出方法を記載しています。リンクをクリックして直接確認できます。

  1. [1] Bankrate — Survey: Nearly half of Americans who lend cash to loved ones face negative consequences
    Survey: Nearly half of Americans who lend cash to loved ones face negative consequences
    統計値
    46% of those who lent money to family or friends experienced negative consequences including lost money, damaged credit, or harmed relationships
    抜粋
    “"Nearly half (46%) of those who lent cash to loved ones experienced a negative consequence as a result, whether it was losing money, damaging a relationship or seeing a decline in their credit score." ”
    出典データ
    2019-09-25
    アクセス日
    2026-04-25
    計算過程
    Bankrate surveyed 2,490 US adults in August 2019. The 46% negative-consequences figure is the broadest measure. Of those, 37% specifically lost money and ~20% experienced relationship damage. We use 0.35 as the regret_rate (midpoint of 24% direct regret from LendingTree and 46% negative outcomes from Bankrate).
  2. [2] LendingTree — Lending Between Family or Friends Results in Guilt, Hurt Feelings and Regret, Survey Finds
    Lending Between Family or Friends Results in Guilt, Hurt Feelings and Regret, Survey Finds
    統計値
    24% of family/friend lenders regret their decision to lend money; lending between family or friends is likely to result in guilt, hurt feelings, or regret
    抜粋
    “"24% of family/friend lenders regret their decision to lend money in the first place." ”
    出典データ
    2019-11-13
    アクセス日
    2026-04-25
    計算過程
    LendingTree commissioned Qualtrics to survey 1,022 US consumers (620 of whom lent and/or borrowed money among family or friends in the last five years) in November 2019. The 24% is a direct regret measure, lower than the 46% negative-consequences figure from Bankrate because it captures explicit regret rather than any negative outcome.

出典: 不作為

根拠台帳

以下の各数値は各出典が報告した内容であり、引用した原文の抜粋と算出方法を記載しています。リンクをクリックして直接確認できます。

  1. [1] LendingTree — 31% of Americans Say a Friend or Family Member Owes Them Money
    31% of Americans Say a Friend or Family Member Owes Them Money
    統計値
    26% say money ended a relationship because they refused to lend; relationship loss is the primary negative outcome of refusing
    抜粋
    “"Among reasons why the subject of money ended a relationship, 26% say it was because they refused to lend the money." ”
    出典データ
    2021-10-20
    アクセス日
    2026-04-25
    計算過程
    LendingTree commissioned Qualtrics to survey 2,051 US consumers in October 2021. The 26% represents those who lost a relationship specifically because they refused to lend. We use 0.26 as the regret_rate, noting that it measures relationship loss (a proxy for regret) rather than direct decisional regret.
  2. [2] LendingTree — Survey: Many Americans Prefer Debt Over Borrowing From Family
    Survey: Many Americans Prefer Debt Over Borrowing From Family
    統計値
    Many Americans would rather take on formal debt than borrow from family, suggesting that the social costs of family lending cut both ways
    抜粋
    “"Many Americans say they would prefer to go into debt rather than borrow from a family member or friend, highlighting the social risks inherent in mixing money and personal relationships." ”
    出典データ
    2022-06-15
    アクセス日
    2026-04-25
    計算過程
    Contextual support showing that the social costs of family lending are widely recognized. The preference for formal debt over family borrowing suggests that both lending and refusing carry relational risk.

注意事項

The action-side and inaction-side figures measure different things: the 35% captures financial loss and general negative outcomes from lending, while the 26% captures relationship loss from refusing. These are not equivalent regret measures — one is primarily financial harm, the other is relational harm. A true apples-to-apples comparison would require the same instrument applied to both groups. The surveys are also from different years and slightly different populations. The delta of 0.09 exceeds the 0.05 threshold, so we classify as action_dominates — lending carries a higher measured regret rate than refusing. However, the qualitative difference in regret type (money lost vs relationship lost) means the directional label should be read with caution; both sides carry substantial and differently-flavored downsides. Survey data are drawn exclusively from United States samples; satisfaction and regret rates in countries with different institutional structures — housing markets, credit culture, retirement systems, or social norms — may differ substantially.

生データ: /api/decisions.json

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