Trevor Swan independently developed the neoclassical growth model. Swan (1956) was published ten months later than Solow (1956), but included a more complete analysis of technical progress, which Solow treated separately in Solow (1957). Reference is sometimes made to the quot;Solow-Swan growth...

There have been many tests of the convergence hypothesis yielding many different estimates of β (the speed of convergence). Narrative reviews of the convergence literature hint at possible reasons for the study-to-study variation in the value of β, but such reviews are selective and informal....