Caiff busnesau sy'n gwerthu nwyddau'n uniongyrchol i'r cwsmeriaid sy'n eu defnyddio eu diffinio fel manwerthwyr. Yr ystadegyn allweddol ar gyfer manwerthu yw'r Mynegai Gwerthiannau Manwerthu (RSI), a gyhoeddir yn fisol. Mae data yn y RSI yn ymdrin â gwariant ar nwyddau yn unig (mewn siopau ac ar-lein). Mae data am wario ar wasanaethau ar gael ym Mynegai Gwasanaethau (IoS).
In the three months to October 2018, the quantity bought in retail sales increased by 0.4% when compared with the previous three months; a slowdown to growth when compared with the strong summer sales, which reached a high of 2.3% in the three months to July.
In October 2018, the quantity bought fell by 0.5% when compared with September 2018, with a strong decline of 3.0% in household goods stores following a particularly strong August and September.
When compared with the previous year, the quantity bought in October 2018 increased by 2.2%, with growth across all sectors except fuel, which fell by 1.8%.