{"index": {"name": "Copper", "level": "industry", "country_code": "CN", "sector": "Basic Materials", "industry": "Copper", "constituent_count": 15, "latest": {"week_ending": "2026-05-29", "index_value": 3022.73230642, "weekly_return": -1.90233402, "constituents": 15, "advancing": 4, "declining": 11, "unchanged": 0, "trend_line": 2681.484088, "activity_lines": {"activity_5": 3040.290273, "activity_10": 2952.036986, "activity_20": 2856.4647, "activity_30": 2792.469603}, "fair_value": 1604.052895, "trend_signal": 1}, "summary": "For the week ending 29 May 2026, Copper declined 1.90% with 4 advancing, 11 declining, and 0 unchanged constituents.", "links": {"chart": "https://sharemaestro.com/structure/cn/basic-materials/copper/", "api": "https://sharemaestro.com/api/structure/cn/basic-materials/copper/", "share_image": "https://sharemaestro.com/structure/cn/basic-materials/copper/share-image.svg"}}, "available": true, "methodology": {"country_code": "CN", "asset_type": "equity", 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