[eng] This paper presents the difficulties that have occured for a few years in the investment econometric forecast. Section 1 studies the investiment usual model adjustements : section 2 emphasizes the several regime model contributins to the understanding of investment evolution. The last...

[eng] For twenty years in France, specific investment grants, such as tax allowances or modifications of depreciation rules have been implemented at different times. This paper presents the various measures and their impact on firms' investment. The results of the econometric study show a...