In This Note, We Shall Demonstrate a Slight Extension of the Envelope Theorem and Use It to Prove That an Intertemporatl Economy Can Be Spanned Or Represented by a Sequence of Temporary Economies, Each of Them Preserving the Geometrical and Analytical Structure of the Previous One.

Ce Texte Constitue un Survol des Differentes Approches Destines a Mesurer le Progres Technique. Nous Utilisons une Notation Uniforme Tout au Long des Demonstrations Mathematiques et Nous Faisons Ressortir les Hypotheses Qui Rendent L'application des Methodes Proposees Envisageable et Qui En...

In this paper, we use linked employer-employee administrative tax data from Canada to estimate the impact of payroll taxes on a variety of firms and workers outcomes. At the firm level, we use geographic and time variations in tax rates to identify the effect of payroll taxes on wage growth at...