Based on theoretical observations that the theory of Movement or Displacement has the problem of Economy, an alternative way of computation called Simultaneous Merge in Multidimension is suggested. Instead of step-wise Merge of full-fledged features and cyclic, or phase by phase derivation of structures, one-fell swoop of Merge in Multi-dimension for occurrences of copies with different sets of underspecified features is assumed. Only specified occurrences survive into interfaces, where they are concatenated under the principle of Inclusion operating on the comparative set properties between occurrences.
2. Theoretical Observations on Movement or Internal Merge
3. Simultaneous Merge