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 January 2020, the quantity bought in the retail sales industry fell by 0.8% when compared with the previous three months, with declines across all sectors.
Retail volumes increased by 0.9% in January 2020, recovering from the falls in the previous two months; the increase was mainly because of moderate growth in both food stores (1.7%) and non-food stores (1.3%).
Fuel saw a large fall of 5.7% in the quantity bought in January 2020 when compared with December 2019, which coincides with a rise in fuel prices of 2.3 pence per litre between December and January (consumer price inflation, January 2020).