The demand and supply of the bitcoin in the market that whats make it go high and stronger in the market bitcoin users are increasing rapidly so the bitcoin demand is also increasing at a time.
This is what makes bitcoin strong in the market, one of which was high market demand, but with a limited number of products, I think in the next few years bitcoin price will be 2x the current price
Then that just also means that the demand will be 2 times more than today, which will be very great. The higher the price go, the more people are attracted to invest their money in bitcoin, so now, the only problem, I think, is the transaction, the more the user, the sliwer the transaction. More cars, more traffic.
trading on exchanges doesn't cause transactions though. the price is going so high because more and more people are just learning about bitcoin and buying into it in hopes of making money via appreciation. most of the world still does not know about bitcoin, there is still a long way until investor satuartion, when that happens there could be a massive fall though. check out the dutch "tulip mania" from the 1600s