甚麼原因美元對所有外幣升得這麼勁？

I think the main reasons are that market realized that there were slowdown in Euro zone, Canadian, Australian and New Zealand economies. Their respective central banks: ECB, BoC, RBA and RBNZ will cut their interest rates to boost the slowing down economies. However, US interest rate has been bottomed out (Fed fund rate currently is 2.00%). Therefore, the narrowing interest rate differential, together with worsening economies, pumped up the USD and drag down their currencies. I believe that US economy would deteriorate in future again and USD will collapse in middle and long term horizons.

唔知會唔會係布殊去睇奧運之前同胡主席見過面，被超上賓禮待，而美籃大數國家隊，菲比斯又攞金牌兼破世界紀錄，心情大靚，返美國做番啲野，令到美元勁升，經濟好轉，咁樣大家咪可以繼續齊齊玩囉。