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My questions are:
→How can you relate investment and business?
I think that you have already said it in your op post that investment and business are not the same, a business is an act of buying and selling that generate income for you in a weekly or monthly basis, while an investment is anything that you put your money in that appreciate in value overtime and gives you a return in the future.
That being said, you can rely on your business for survival, but you can't rely on your investment to survive because it takes years to give back a better ROI.
→Can an investor also be called a businessman?
No, an investor makes money even when he is as sleep, while a business man must put in a lot of work physical and mentally for it to yield profit.
Actually, business and investment are inter-related.
A business person puts in money to buy goods despite how small or big in exchange for returns.
Though it requires his presence efforts and time to make it profitable.
For as long as he remained in that business year after year, the value of those goods either appreciate for greater income with eas
or the value depreciate.
So also is an investor who invested in an asset.
You there not sit with a folded arms to watch.
You must be present, spending time seeking for more knowledge and constantly checking up on the investment which might with time appreciate in value for greater profits or depreciate.