Fears over Trump Amazon tweet and trade war
Dow Jones enjoys third largest ever gain
Asian stock markets also down
Buoyed by Trump's tax promises
Number of stocks reset to $123.47
The US Nasdaq index has closed above its dotcom boom record for the first time in 15 years.
The Nasdaq index suffered its worst day since 2011 yesterday, dropping over 3% as investors continued to switch out of technology and biotechnology holdings.