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The purpose of this paper is to look at the effect of profit sharing (PS) on the ability of the firm to take care of the environment.

In a large cross-section of French firms, the authors find strong associations between PS and various innovations with environmental benefits. With cross-sectional data from the Community Innovation Survey and FARE, the authors estimate simultaneous equations for these effects, with endogenous PS.

This relationship between PS and environmental innovation is plausible, since workers benefit more than outside owners from a better local environment. To the best of the authors’ knowledge, this paper provides the first empirical evidence, so the results suggest PS supports environmental policy, in addition to its other, better known incentive benefits.

Further studies, using panel data, are needed.

Financial participation may be considered as an additional tool to protect the environment.

This is the first paper looking at the impact of PS on the ability of the firm to take care of the environment. In this critical period when policy makers are searching for ways to limit global warming and protect the environment, the authors have presented here the first evidence that financial participation helps to support these policies.

France is the third country in Europe after Italy and Spain for the number of employee-owned firms, with some 2,600 worker cooperatives (SCOPs). The authors propose a comprehensive review of SCOPs and any barriers to their expansion.

The authors analyse relevant legislation; review the rich empirical economic literature on SCOPs; and offer new descriptive empirical evidence comparing SCOPs and other French firms.

SCOPs benefit from a consistent legal framework and a well-structured and supportive cooperative movement. Cooperative laws allow attracting external capital, provide barriers against degeneration and encourage profit allocations that favour investment and labour. SCOPs are distributed across a wide range of industries; are larger than conventional firms, as capital intensive, more productive and survive better. Despite this good performance their number remains modest, perhaps because of information barriers.

An examination of the Italian and Spanish experiences and the relationship between SCOPs and the French labour movement might contribute to explaining the modest number of SCOPs.

The first comprehensive review of French worker cooperatives in four decades and the first with extensive comparative data on SCOPs and conventional French firms. With some of the best data on worker cooperatives in the world, findings have international relevance.

This paper uses an unbalanced panel of 129 French firms over the period 1981–1991 to test the effects of two participatory schemes – profit sharing and employee share ownership – on voluntary quits. The effects of sharing schemes on productivity are well documented and most studies show positive and significant effects on productivity but their effects on quits have been less studied. This paper is the first French study looking at the effects of profit sharing and employee share ownership on quits. Our empirical investigation shows that employee share ownership reduces voluntary quits significantly whereas pure profit sharing has no significant effect.

This volume of Advances in the Economic Analysis of Participatory and Labor Managed Firms consists of nine original papers grouped together under the title of “Employee Participation, Firm Performance and Survival.” The first four papers explore the growing area of empirical studies of participatory and labor-managed firms’ survival. The second group of three papers offers a number of new approaches and insights into the performance effects of participatory firms, while the final group of papers provides a broad-ranging synthesis and assessment of the experience of employee ownership and participation in transition.

The aim of this paper is to make lightweight high-performance concrete (LWHPC) with high economic performance from existing materials on the Algerian market. Concrete with high values with regard to following properties: mechanical, physical, rheological and durability. Because of the implementation of some basic scientific principles on the technology of LWHPC, this study is part of the valuation of local materials to manufacture LWHPC with several enhanced features such as mechanical, physical chemical, rheological and durability in the first place and with regard to the economic aspect in the second place.

The experimental study focused on the compatibility of cement/superplasticizer, the effect of water/cement ratio (W/C 0.22, 0.25, 0.30), the effect of replacing a part of cement by silica fume (8 per cent), the effect of combined replacement of a part of cement by silica fume (8 per cent) and natural pozzolan (10 per cent, 15 per cent, 25 per cent) and the effect of fraction of aggregate on properties of fresh and hardened concrete using the mix design method of the University of Sherbrooke, which is easy to realize and gives good results.

The results obtained allow to conclude that it is possible to manufacture LWHPC with good mechanical and physical properties in the authors’ town with available materials on the Algerian market. The mix design and manufacture of concrete with a compressive strength at 28 days reaching 56 MPa or more than 72 MPa is now possible in Biskra (Algeria), and it must no longer be used only in the experimental field. The addition of silica fume in concrete showed good strength development between the ages of 7 and 28 days depending on the mix design; concrete containing 8 per cent silica fume with a W/B (water/binder) of 0.25 has a compressive strength higher than other concretes, and concrete with silica fume is stronger than concrete without silica fume, so we can have concrete with a compressive strength of 62 MPa for W/C of 0.25 without silica fume. Then, one can avoid the use of silica fume to a resistance of concrete to the compressive strength of 62 MPa and a slump of 21 cm, as silica fume is the most expensive ingredient in the composition of the concrete and is very important economically. A main factor in producing high-strength concrete above 72 MPa is to use less reactive natural pozzolan (such as silica fume) in combination with silica fume and a W/B low of 0.25 and 0.30. The combination of silica fume and natural pozzolan in mixtures resulted in a very dense microstructure and low porosity and produced an enhanced permeability of concrete of high strength, as with resistance to the penetration of aggressive agents; thus, an economical concrete was obtained using this combination.

The study of the influence of cementitious materials on concrete strength gain was carried out. Other features of LWHPC such as creep, cracking, shrinkage, resistance to sulphate attack, corrosion resistance, fire resistance and durability should be also studied, because there are cases where another feature is most important for the designer or owner than the compressive strength at 28 days. Further studies should include a range of variables to change mixtures significantly and determine defined applications of LWHPC to produce more efficient and economical concretes. It is important to gather information on LWHPC to push forward the formulation of characteristics for pozzolan concrete for the building industry.

The LWHPC can be used to obtain high modules of elasticity and high durability in special structures such as marine structures, superstructures, parking, areas for aircraft/airplane runways, bridges, tunnels and industrial buildings (nuclear power stations).

The novel finding of the paper is the use of crystallized slag aggregates and natural pozzolan aggregates to obtain LWHPC.