It all depends your understanding with each other & tolerance. No doubt, when a person has to invest on another person along with him will definitely increases his/her expenditure but as I said if both have good understanding & strong relationship then both will spend freely but with cautious thinking whether such thing is really required or not
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If any person spends money on needless things then of course any salary will seem less to that person. So as our PROPHET MOHAMMAD (p.b.u.h.) said that "Be neutral in spending your wealth"
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Hence i would say 50 - 50 in this forum about both women & men.