{"index": {"name": "Copper", "level": "industry", "country_code": "HK", "sector": "Basic Materials", "industry": "Copper", "constituent_count": 6, "latest": {"week_ending": "2026-05-29", "index_value": 3524.20162717, "weekly_return": -6.20868474, "constituents": 6, "advancing": 1, "declining": 5, "unchanged": 0, "trend_line": 4035.003452, "activity_lines": {"activity_5": 3736.389875, "activity_10": 3775.267844, "activity_20": 3899.910757, "activity_30": 4003.114512}, "fair_value": 2343.09325, "trend_signal": 0}, "summary": "For the week ending 29 May 2026, Copper declined 6.21% with 1 advancing, 5 declining, and 0 unchanged constituents.", "links": {"chart": "https://sharemaestro.com/structure/hk/basic-materials/copper/", "api": "https://sharemaestro.com/api/structure/hk/basic-materials/copper/", "share_image": "https://sharemaestro.com/structure/hk/basic-materials/copper/share-image.svg"}}, "available": true, "methodology": {"country_code": "HK", "asset_type": "equity", 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