Best Day to Buy Brazil Index :ThursdayWorst Day to Buy Brazil Index :Friday 1993-2011 – Buy on Close of Day. Sell on Close next day.Commissions =Slippage=0. Buying On Thursday Sell next Day. $1,000 growth. —————————————— Buying on Friday. Sell next Day $ 10,000 growth. ——————–Note to myself:Best EOM buy Days: Monday or Tuesday.