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).
The underlying pattern in the retail industry in October 2017, as suggested by the three-month on three-month measure is one of growth, with the quantity bought increasing by 0.9%.
The quantity bought in October 2017 increased by 0.3% compared with September 2017; non-food stores, in particular second-hand goods stores (charity shops, auction houses, antiques and fine art dealers) provided the largest contribution to this growth.
The longer-term picture as shown by the year-on-year growth rate shows the quantity bought fell by 0.3% in comparison with a strong October 2016; food stores provided the largest contribution to this fall.