Bank of Japan Gov. Haruhiko Kuroda has a new plan. He's going to buy ¥300 billion ($2.5 billion) of something that doesn't exist.

Markets were roiled Friday after the BOJ unveiled measures including purchasing exchange-traded funds that track companies which are "proactively making investment in physical and human capital."

The central bank will spend ¥300 billion a year from April buying such securities to offset the market impact as it resumes selling stocks purchased earlier from financial institutions.