E. NISSAN, F. NIROOMAND
694
at the proportion of the intra-group dispersion which was
reduced for both efficiency and productivity. In other words,
the constituent groups of countries by income became
more identified among themselves moving from 1965 to
1990. The groups stayed still, with no movements out of
their positions. Another finding relates to levels of con-
vergence. Even though the group s of coun tries were lo c k e d
in their positions between 1965 and 1995, the findings on
convergence for efficiency and productivity tell a differ-
ent story. With the exception of the low-income group,
the groups as well as all countries show convergence for
efficiency. This means that some countries within the lo w-
income groups moved away from the expected path of
that group, some better than expected and some worse t ha n
expected. For productivity, th e higher income groups (hi gh
middle, high) showed convergence while the rest showed
divergence, meaning that richer countries tended to dis-
play stronger tendencies toward convergence as compar ed
to poorer countries. For both efficiency and productivity,
countries that performed better or worse than expected
were identified.
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