So also when the market is down to some extent, the person with $30 may likely loss more because of the money is small. Blockchain has the minimum amount one can invest if am not mistaken but if your amount is too small may be difficult to make easy progress.
What do you think about my advised to him?
Hey mate, I think your response or answer to your friend is not really fair. As we all know bitcoin price increases and decreases by percentage and therefore whatever every investment one puts in is multiplied by the number f percentage increase in bitcoin price likewise when in decline.
Crypto market is a kind of market investment where by when one invest more or higher, the profit in waiting When the market goes up increases too same when the market goes in decline the losses too replicate itself with the volume of the investment. Just as @fivestar4evermvp has explained so it is.