在张朝阳的文章：Study of Measurement and Determinants of Intra-industry Trade in East Asia中，对产业的内部规模经济的衡量是这样规定的：

“economies of scale was constructed using the ratio of gross fixed capital formation in industry k to value added in industry k.”

由于事关学术严谨，不敢妄自揣测，清高人指点一下，什么意思？是固定资产净增加值吗？