The paper presents a new framework to assess firm level heterogeneity and to study the rate and direction of technical change. Building on the analysis of revealed short-run production functions by Hildenbrand (1981), we propose the (normalized) volume of the zonotope composed by vectors-firms...

This paper examines the influence of capital accumulation and imports on the relative demand for skilled and unskilled labour in Hungary between 1980 and 2002. Historical data shows that both relative employment and wages of skilled labour were favourably influenced by the changes of the past...