Why investment banks with retail arms are better in Markets business

The question might be quite trivial, yet couldn't find a good explanation for that which wouldn't contain nothing but generic terms.

So as we can see that investment banks which are supported by retail arms are more successful in their Markets businesses. From my understanding it's because they have larger balance sheets, and potentially access to cheaper funding but still this isn't a straightforward explanation (for me) why they can have more securities in their inventories etc. which makes them better in secondary market trading businesses. Can someone explain this more accurately please?

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