An economy is considered to be at full employment when there's only frictional and structural unemployment.

在只有摩擦和结构性失业的情况下，经济被认为是充分就业。

This postulate is compatible with what may be called 'frictional' unemployment.

这个假设与所谓的“摩擦性” 失业是相容的。

But these two categories of 'frictional' unemployment and 'voluntary' unemployment are comprehensive.

但这两类“摩擦性” 失业和“自愿性” 失业是综合性的。

Furthermore, it will be convenient to exclude 'frictional' unemployment from our definition of 'involuntary' unemployment.

此外，从我们对“非自愿” 失业的定义中排除“摩擦性” 失业会很方便。