CrowdStrike IT outage highlights tech firm dominance and potential market risks

The CrowdStrike IT outage, which brought the world's PCs to a blue-screen standstill, might be in the rear-view mirror, but it has highlighted concerns about the dominance of a handful of tech firms. This dominance is especially evident on the U.S. stock market. As Alan Kohler explains, it could be setting the world up for a crash of a different kind.