如果长期成本函数为c（y)=y²+1，那么，该厂商的长期供给曲线是什么？If the long-run cost function is c（y) =y²+1，what is the long-run supply curve of the firm？

题目：如果长期成本函数为c（y)=y²+1，那么，该厂商的长期供给曲线是什么？If the long-run cost function is c（y) =y²+1，what is the long-run supply curve of the firm？