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Unnecessary predictors

Wich predictor(s) should effectively be excluded?

Coefficients:
                Estimate Std. Error t value  Pr(>|t|)    
(Intercept)       2.2561     0.5654   3.991  0.000117 ***
PRICE            -2.6857     0.7921  -3.390  0.000959 ***
Price.lag         3.9920     0.7959   5.016  1.96e-06 ***
DISPLAY           0.4570     0.1279   3.572  0.000521 ***
Display.lag       0.5097     0.1180   4.319  3.36e-05 ***
COUPON            1.7531     0.1576  11.121   < 2e-16 ***
Coupon.lag       -0.2098     0.1567  -1.339  0.183344    
DISPLAYCOUPON     2.0087     0.2017   9.960   < 2e-16 ***
DisplayCoupon.lag 0.4489     0.2112   2.126  0.035695 *  
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