marginal
mor juh nuhl
- s  at or constituting a border or edge
                    
                        
                            
the marginal strip of beach - s  of questionable or minimal quality
                    
                        
                            
marginal writing ability - s  just barely adequate or within a lower limit
                    
                        
                            
a marginal victory - s  producing at a rate that barely covers production costs
                    
                        
                            
marginal industries 
- I have tried to remove the marginal tax rates be it at the lowest end or the highest end.
 - Thirdly, the twin sister of "all marginal tax rates cause increased revenue" is the equally silly "all marginal rate increases cause increased revenues" which you seem to indicate .
 - The marginal product has accurately reflected hard economic times in the past.