According to the first step of this analysis, Wales had a comparative advantage in 8 out of the 66 broad product groups over the 2015 to 2017 period.
Yn ôl cam cyntaf y dadansoddiad hwn, roedd gan Gymru fantais gymharol mewn 8 o’r 66 grŵp cynnyrch eang dros gyfnod 2015 i 2017.