I don't think that the world economic factors will affect the price of altcoin because it's far beyond of this and the crypto is not reaching the economic factor in a country. so I think the factor is because people get panic to see the price is down and they are worried if the price still down too deep so they sell their coins to prevent more losses. besides that, I think if there is any bad news that will cause bitcoin price to down and it will affect the altcoin price too.