What factors can affect to price of altcoin? Can price of altcoin depend on world economic factors or economic occurrences?
There are really many factors that influence any market and trying to justify and find reason might be pointless sometimes. Altcoins are usually tied with bitcoin price but this doesn't have to be this way, mostly what affects their price is what dev team is doing in the background and how well is marketing done as well as shilling on the internet.
I think that potentially the prices should be affected by the development process and some technical upgrades, but it not the case. Surely the world economy is also not something important here. Investors and what they care about is. Unfortunately, as the market's price pumps and drops show, what really matters here is news on what various companies plan to do. News on wallet update on NEO got its price like a temporary 20% growth, for instance, while some half-fake news about Korea banning the exchanges and then the news on Facebook and Google banning ads made the whole market go about 50% down. People should admire the ideas, the tech and stuff like that, but they care about some regulations and advertising instead.