The relative performance of small caps lags the S&P 500 by 75% since 2018, and we wondered why.  Was the Magnificent 7 effect so exaggerated that Info Tech and Communication Services, the sectors at the epicenter of the mega-cap growth boom, created such an overwhelmingly high hurdle that small caps were not able to keep pace with these powerhouse companies?  Alternatively, has small cap weakness been the product of sluggish results across multiple sectors, irrespective of the mega-cap growth issue, such that large caps were superior no matter which direction you looked? We label these two hypotheses as “deep” (relating specifically to the narrow but intense Mag 7 effect in Info Tech and Comm Services) or “wide” (describing failings across most small cap companies and industries) and designed this study to identify the most likely explanation.