This article in the Economist magazine...

This article in the Economist magazine (https://www.economist.com/news/briefing/21695385-profits-are-too-high-america-needs-giant-dose-competition-too-much-good-thing.). suggests, based on significant evidence, that competition in American markets is not only constrained, but is becoming less so, as fewer companies dominate business.

In another article, published by the IMD World Competitiveness Center (https://www.imd.org/news/updates/new-competitive-global-elite-emerges-in-imd-business-schools-latest-world-competitiveness-ranking/,) the US is shown as being fourth in global economic competitiveness, after Hong Kong and Switzerland.

These two publications are using the word "competition" in different ways -- please describe how it is being used in each case.

Our model of Supply & Demand is based on a model of perfectly competitive markets. If our markets are not competitive, how does that affect this model?

 It should be a few paragraphs long and include a reference to evidence to back up what you are saying