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investigate some relations of the problem of A/A-bar partition of movement types and the proper formulation of economy principles. In Chapter 2, I will explore two interrelated problems of scrambling. The first one, called the landing site problem, is why and how the apparently single operation scrambling behaves A-movement and A-bar-movement. The second one, called the optionality problem, is whether scrambling is arm optional operation, and if so, why it can v~olate the last resort principle. The answer to the first question leads to the derivational view of AIA-bar parti tion. The answer to the second question lead to a system of effect-based economy principles. In particular, the last resort principle is replaced by the compensation principle which requires the external effect of movement to be compensated for by its internal effect. In Chapter 3, I will discuss the problem of uniformity of chain-steps and suggest that the cnifonnity can be derived from stepwise application of compensation principle, rt;3 discusses complex cases such as German partial w h-movement and Mayan focus antipassives in light of the compnsation principle and derivational view of A/A-bar-parbtion