PARITY AGREEMENTS BY NEW YORK CITY ARE TERMED ILLEGAL
NYS Public Employment Relations Bd rules illegal parity agreements by city that assured uniform workers of relatively equal wage and benefit improvements in their contracts; decision supports PBA contention that it was improper for city to enter into such agreements and then to attempt to rely on parity clause to resist PBA demands for wage and benefit increases greater than those already granted other groups; PBA head Douglas Weaving comments (M)