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thank you for the answers. this will help a lot for my thesis :)

i see your point. however it doesnt really apply in my case. im testing mobilprices for some number of variables. in my regression i get collinearity between a markets concentration ratio (measured as hhi) and the intercept. it doesnt apply to any economic reasoning so could it be just a coincidence...

I would really appreciate some assistance to the question how the intercept term and anotehr coefficent could be collinear

thanks for your quick answers! your right, it had actually decreased. still though how can i interpret c(1) and another coefficent to be collinear? and that c(1) becomes significant first after removing this coefficent?

when testing for multicollinearity i used confidence ellipse which implies that c(1) (intercept) and another coefficent is collinear. If i remove the other coefficent c(1) is now significant and R2 is slightly higher. I do not see the logic behind collinearity between the intercept and another coeff...

I estimated the following linear regression in Eviews: Dependent Variable: PRIS Method: Least Squares Date: 07/12/10 Time: 16:35 Sample: 1 32 Included observations: 32 Variable Coefficient Std. Error t-Statistic Prob. C 11.09973 64.36392 0.172453 0.8647 MARK 0.218873 0.404334 0.541318 0.5940 HHI 0.0...