{"schema":1,"name":"WPI inflation and the WPI-CPI gap","resolution":"monthly","generated_at":"2026-10-01T13:26:56Z","meta":{"source":"Office of the Economic Adviser (DPIIT), via MoSPI eSankhyiki","unit":"% year on year; gap in percentage points","join":"Growth rates are computed inside one base year and never across a base change. Where bases overlap, the newest base is used from the first period it has its own year-ago value; 'segment' says which base each value comes from.","dates":"Monthly and quarterly values are dated by the first day of the reference period (2026-08-01 = August 2026; 2026-04-01 = Apr-Jun 2026). 'period' gives the label.","checks":{"base_overlap_yoy":{"wpi":{"bases":["base 2022-23","base 2011-12"],"periods":25,"from":"2024-04-01","to":"2026-04-01","mean_diff_pp":-0.402,"max_abs_diff_pp":1.038,"correlation":0.985},"primary":{"bases":["base 2022-23","base 2011-12"],"periods":25,"from":"2024-04-01","to":"2026-04-01","mean_diff_pp":-0.387,"max_abs_diff_pp":5.206,"correlation":0.917},"fuel":{"bases":["base 2022-23","base 2011-12"],"periods":25,"from":"2024-04-01","to":"2026-04-01","mean_diff_pp":-0.352,"max_abs_diff_pp":2.894,"correlation":0.987},"manufactured":{"bases":["base 2022-23","base 2011-12"],"periods":25,"from":"2024-04-01","to":"2026-04-01","mean_diff_pp":-0.397,"max_abs_diff_pp":2.056,"correlation":0.905},"food_index":{"bases":["base 2022-23","base 2011-12"],"periods":25,"from":"2024-04-01","to":"2026-04-01","mean_diff_pp":-0.885,"max_abs_diff_pp":2.569,"correlation":0.96}},"base2011_headline_recomposed_max_abs_pct":0.076},"method":"WPI year-on-year from published index levels: base 2011-12 to Mar 2024, base 2022-23 from Apr 2024. 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