Technology allows businesses to be global operations, and even the smallest business can have clients in every time zone. Different countries and different cultures may have different preferences, however; what sells well in one place may never sell in another place.
Circular knitting or knitting in the round is a form of knitting that creates a seamless tube. When knitting circularly, the knitting is cast on and the circle of stitches is joined. Knitting is worked in rounds (the equivalent of rows in flat knitting) in a spiral. Originally, circular knitting was done using a set of four or five double-pointed needles.
A chain stitch is usually done in crochet. But your curling is symptomatic of knitting stockinette stitch (knit 1 row and purl 1 row). The way to stop the curling is to do all knit 8 stitches at beginning and end of each and every row.