Welcome to Market Catalyst. I'm Ally Canel. We're 30 minutes into the US trading day.Let's get to the three market catalysts we're watching this hour. First up, we'll dig into the tech selloff after $500 billion was wiped from chip stocks. Plus, we'll hone in on McDonald's results as the company boosts its growth forecast.And as consumers opt for value, we'll also take a look at the slowdown in fast casual chains with Cava CEO Brett Schulman. But first, let's take a look at the major averages because we are ...