Strong productivity growth, steady regional bank fundamentals and accelerating artificial intelligence adoption may be laying the groundwork for a more durable small-cap rally than investors have seen in years.The small-cap benchmark – tracked by the iShares Russell 2000 ETF (NYSE:IWM) – has repeatedly pushed to record highs this month, outperforming large-cap indices — a rare dynamic after years of narrow market leadership dominated by mega-cap stocks.Despite those gains, the macro and fundamental case for ...