In the past decade, disrupters have changed dramatically, says Columbia Business School’s Rita McGrath, this week’s guest on the Three Big Points podcast. Disrupters now enter the market with products and services that are just as good as those offered by legacy companies — making it harder than ever for legacy businesses to compete. But, McGrath says, it’s within any company’s power to take on the upstarts — if they’re open-minded in responding to change.