Bank of Korea Governor Shin Hyun-song is giving an inauguration speech at the inauguration ceremony held at the Bank of Korea annex in Jung-gu, Seoul on April 21. Yonhap News The Bank of Korea announced that a single-stock leveraged exchange-traded fund (ETF) that tracks twice the daily returns of Samsung Electronics and SK Hynix could strengthen the ‘concentration’ phenomenon in the domestic stock market and increase volatility. This is the second time, following the Financial Supervisory Service, that financial authorities have warned of the side effects of single-stock leverage.