Global stock markets are seeing sharp declines and bitcoin has lost this year's gains as worries intensify that the AI (artificial intelligence) boom has become a bubble fit to burst. A small tear has certainly appeared in US tech stocks over the past week, with the tech-heavy Nasdaq closing below a key technical indicator for the first time since late April on Monday. Key worries include not only high valuations but also vast investment spending in the AI space harming and delaying investor returns. Sharp stock market falls were seen across large parts of Asia and Europe following the retreat on Wall Street. Japan's ... (full story)