The above-mentioned paper was inadvertently published with a mistake.

Please find further details and the correct information below:

Towards the end of page 23, at the end of the second to last paragraph of the Proof of Proposition 2, the online version is correct while the pdf is missing some terms.

The correct version should read as follows:

Hence,

$$\displaylines{\left( {\tau _{1,coop}^C - M{D^C}} \right) + \left( {t_{2,coop}^C - M{D^C}} \right) = \cr \left( {\tau _{2,coop}^C - M{D^C}} \right) + \left( {t_{1,coop}^C - M{D^C}} \right) > \left( {\tau _{1,coop}^{JM} - M{D^{JM}}} \right) + \cr \left( {t_{2,coop}^{JM} - M{D^{JM}}} \right) = \left( {\tau _{2,coop}^{JM} - M{D^{JM}}} \right) + \left( {t_{1,coop}^C - M{D^{JM}}} \right) \cr}$$
(1)

Springer wishes to apologize for any inconvenience caused.