That corporation doesn't seem particularly effective at capturing marketshare (a proxy for the combination of price and quality). Total revenue of $16B across 4

That corporation doesn't seem particularly effective at capturing marketshare (a proxy for the combination of price and quality). Total revenue of $16B across 4 major industries makes it a tiny player. Goldman Sachs had $59B in 2021 revenues alone, nevermind all the other big banks. The Wikipedia article further says "comparatively low wages [for managers] can make it very difficult to recruit managers from investor-owned firms". Given the impact that skilled managers have historically had on companies (ex: Steve Jobs @ Apple, Lisa Su @ AMD, Howard Schultz @ Starbucks, etc), it seems unlikely that such an organization could effectively compete against normal corporations led by skilled CEOs. And before you say that competition is not supposed to be the point of production, your geopolitical enemies aren't going to care about your nice ideals. If they can outcompete your inefficient economy and economically dominate you they will. You can't beat the market, even under socialism/communism.