Trade unions distort a profit-maximising firm's input choice. The nature of the resulting inefficiency depends on whether there is wage or efficient bargaining. Moreover, trade unions redistribute income and thereby affect welfare. If firms also pursue Corporate Social Responsibility (CSR)...

The high speed rail network represents now a large part of the rail services, 4 sub-networks being concerned from/to Paris. The interoperability between high-speed trunk lines and the rest of the electrified network permits a large coverage of the French territory : the TGV services network is...