4 ideas
In 1978–79, as the campaign against private commerce and tension with China pushed ethnic Chinese to flee, the Ministry of Interior quietly ran a semi-official scheme, known as 'Phương án II', that let them leave by boat in exchange for gold paid per person. Local security officials organised the departures, collected the gold, and sometimes skimmed it. The state that officially condemned the boat people was also brokering and profiting from their flight.
After April 1975, the new authorities ordered former Saigon soldiers, officers and officials to report for 'học tập cải tạo' (study and reform), bringing supplies for ten days or one month depending on rank. Many complied because the stated term was short, and were then held without trial for years, some for more than a decade, in labour camps across the country. The small, believable initial demand secured mass voluntary surrender to an open-ended detention.
Vietnam's economic reform was not designed at the top. Local cadres and enterprises 'phá rào' (broke the fence) first, through illegal household contracting in farming, market pricing in Long An, and off-plan trading by state firms. Once these violations visibly outperformed the plan, the Party ratified them after the fact, which made Đổi Mới in 1986 largely a legalisation of practices already spreading.
Instead of asking only what the victors imposed on the South, ask what the South's economy did to the victors. Northern cadres arriving in Saigon found a material abundance and market society that contradicted what they had been told. The collapse of collectivisation then forced the Party to readopt the market logic of the side it had defeated. Seen this way, 'winning' militarily and winning the argument over how to live come apart.