正解: ACorrect: A
価格・家賃比率は住宅価格÷年間家賃です。比率が高い（例えば25〜30以上）市場では、購入価格に対して賃料が安く、賃貸の方が経済的に合理的である場合が多くなります。The ratio is home price divided by annual rent. In markets where it is high, for example above 25 to 30, rents are cheap relative to purchase prices, and renting is often the more economical choice.
価格・家賃比率は、株式のPER（株価収益率）に似た発想で、住宅を「家賃という収益を生む資産」として評価する指標です。比率が15なら、家賃15年分で家が買える計算になり、購入が比較的有利です。比率が30なら家賃30年分に相当し、購入価格が家賃に比べて高い、つまり賃貸が割安と解釈できます。バンクーバー、シドニー、香港、サンフランシスコ、ミュンヘンなど、比率が高い都市は「住宅価格は高いが家賃はそれほどでもない」状態にあり、賃貸しながら差額を投資に回す戦略が理にかなうことが多いです。逆に米国中西部や一部の新興国都市のように比率が低い場所では購入が有利になりやすいです。ただしこれは出発点にすぎず、保有期間、金利、維持費、税制、価格上昇期待などを加味した総合判断が必要です。選択肢Bのように単一の閾値で機械的に決めるのは誤りです。The price-to-rent ratio treats a home as an income-producing asset, similar to a stock's price-to-earnings ratio. A ratio of 15 means the home costs fifteen years of rent, which makes buying relatively attractive. A ratio of 30 means thirty years of rent, indicating that purchase prices are high relative to rents and renting is comparatively cheap. Cities such as Vancouver, Sydney, Hong Kong, San Francisco, and Munich have high ratios, meaning prices are steep while rents are less so; renting and investing the difference is often sensible there. In low-ratio markets, such as much of the US Midwest or some emerging-market cities, buying tends to be favored. The ratio is only a starting point; holding period, interest rates, maintenance, taxes, and expected appreciation must all be added. Mechanically applying a single threshold, as in choice B, is a mistake.
比率は市場全体の平均であり、個別物件や自分の状況を反映しません。また、住宅は純粋な投資ではなく、安心感、家族の安定、学区、改装の自由といった非金銭的価値を持ちます。数字だけで判断すると、生活の質を見落とす危険があります。The ratio is a market-wide average and does not reflect a specific property or personal circumstances. A home is also not purely an investment; it carries non-financial value such as security, family stability, school access, and freedom to renovate. Deciding on numbers alone risks ignoring quality of life.
まず自分の都市の比率で「経済的にどちらが有利か」の大まかな方向を把握し、その上で保有予定年数、転勤や離婚などの流動性リスク、非金銭的価値を並べて総合的に判断しましょう。「借りて投資する」を選ぶなら、差額を実際に積み立てる仕組みを自動化することが条件です。Use your city's ratio to establish which option is broadly favored economically, then weigh expected holding period, liquidity risks such as relocation or divorce, and non-financial value together. If you choose to rent and invest, automate the investment of the difference; the strategy only works if the money is actually saved.