How Much Longer Can the Luck Last? Mainland Capital Recirculation and the Resilience of Hong Kong's Financial Center (2020-2025)

Abstract This study examines the paradoxical resilience of Hong Kong’s economy from 2020 to 2025: despite a sharp decline in the overseas business share, per capita GDP remained high, unemployment low, and financial services exports robust. The core phenomenological observation is that Mainland Chinese capital outflows—primarily through ordinary resident channels—used Hong Kong as a “firewall” and recirculation hub, compensating for external weaknesses via retention and reinvestment. Large-scale transfers in the earlier period (2010-2019) more often routed through Singapore, but post-pandemic outflows shifted toward Hong Kong (share rising from 35% to over 50%), driven by within-quota remittances, QDII, and interconnectivity mechanisms. This reflects supply-side effects of capital control arbitrage (rightward supply curve shift, multiplier ≈1.8), buffering output gaps from weak overseas demand (12% FDI decline from Europe and the United States). Descriptive associations suggest a 1 percentage point rise in Mainland outflows links to 0.5% growth in Hong Kong financial exports, though sectoral concentration rises (Herfindahl >0.4). This paper is limited to phenomenological observation of publicly available data and imposes no obligation to refine models or conduct full regressions; it is not intended for academic promotion or remuneration, but rather to structure economic phenomena for preliminary insights. Policy implications: Greater Bay Area integration may extend this “luck,” but regulatory reversals pose bidirectional risks. The question remains: how much longer can it last? Keywords: Capital outflows; Recirculation mechanism; Hong Kong financial resilience; Capital control arbitrage; Greater Bay Area integration; Phenomenological observation JEL Classification: F21, F32, G15, O16, R11