SAIGON AIDE SEES ECONOMY KEEPING A PRIVATE SECTOR
S Vietnamese Foreign Min Nguyen Thi Binh, in int conducted in S Vietnamese Embassy in Moscow at end of official 2-wk visit to attend 25th Soviet Party Cong, says S Vietnamese officials have developed long-range plan for more privately oriented econ that N Vietnam is expected to have; explains that after reunification southern area's econ will be arranged in 5-tier system allowing considerable private enterprise to exist alongside form of limited socialism; says farmland will remain in private hands and Govt ultimately will buy all rice produced by individual farmers; aim is to eliminate hoarding and speculation that continues to drive prices higher; describes some of most serious problems and ways in which Govt is attempting to bring radical soc and econ change to country; por (M)
