We knows that the crypto currency investment can give us lot of profits even in short time but this is very new there are lot of invesments like real estate,gold,mutual funds silent partner in businesses and lot more but what you think which has highest ROI in short term other than crypto invesments.
My opinion is that real estate can be that one,since my grandfather used to be like buying and selling the lands and made tons of money in his life time but I didn't do that such kind of traditional invetment.
I wouldn't say "highest ROI in short term" because when you say ROI or return on investment, it refers to the money that you earned in your business that is equivalent to your capital and i believe this should be constant. It is more logical to say " the fastest ROI " because it is time bounded. Well, back to the topic, fastest ROI are achieve in active businesses like buying and selling of goods and services because somehow they have the greatest mark up compared to real estate in which you need to wait for several years or an opportunity like developer's will to buy it before you can see the profit.