Rydym yn defnyddio mynegeion prisiau, megis y Mynegai Prisiau Defnyddwyr (CPI) i asesu chwyddiant - mesuriad o'r gyfradd cynnydd mewn prisiau ar gyfer nwyddau a gwasanaethau. Un modd o ddeall y CPI yw meddwl am fasged siopa fawr sy'n cynnwys detholiad o'r nwyddau a'r gwasanaethau a brynir gan aelwydydd. Mae'r CPI yn amcangyfrif newidiadau i gyfanswm cost y fasged hon.
The Consumer Prices Index including owner occupiers' housing costs (CPIH) rose by 3.0% in the 12 months to August 2021, up from 2.1% in the 12 months to July.
The increase of 0.9 percentage points is the largest increase ever recorded in the CPIH National Statistic 12-month inflation rate series, which began in January 2006; however, this is likely to be a temporary change.
The largest upward contribution to change is a base effect, because, in part, of discounted restaurant and café prices in August 2020 resulting from the government's Eat Out to Help Out scheme and, to a lesser extent, reductions in Value Added Tax (VAT) across the same sector.
Price quote data and item indices that underpin consumer price inflation statistics are now published, giving users unprecedented access to the detailed data that is used in the construction of the UK's inflation figures. With effect from January 2017 Consumer price inflation publication, these data are published on a monthly basis showing the latest month.