Radio waves that strengthened women’s status in postwar Japan
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When Yoko Okuyama discovered a map of postwar Japan’s radio coverage surfaced, it became the key to a new research project
An unexpected discovery on an auction site became the starting point for a research project recently published in the Journal of Development Economics. In the study, researcher Yoko Okuyama shows how radio programs aimed at Japanese women helped promote gender equality in the country during the American occupation after World War II.
"I had the idea for this paper for a long time. But I could not find any data on radio waves in post-war Japan," Yoko Okuyama, researcher in economics, explains.
One day that changed when she was browsing an online auction for radio collectors and stumbled upon a map from the American occupation era. The map showed radio coverage in Japan during the occupation.
“Suddenly everything fell into place, and I could finally tackle the questions I had long wanted to explore," Yoko says.
The study, titled “Empowering Women Through Radio: Evidence from Occupied Japan” (Journal of Development Economics, 2026), combines archival work with economic analysis to reveal how media can help shape social change in turbulent times. The study investigates the impact of radio programs broadcast in Japan during the U.S. occupation (1945-1952). The shows were a part of the occupation authority's effort to dismantle patriarchal norms and promote gender equality and targeted women as their primary audience.
"Unfortunately, no recordings of these shows are available today, but I did find daily summaries of the broadcasts in documents once classified by the U.S. occupation authorities, but later declassified," Yoko explains.
By analysing the summaries, she could reconstruct the radio programmes content and tone. Combined with the radio wave maps, election results from local newspapers, and various government reports, her study finds that greater exposure to the radio show did increase women's electoral turnout and the vote share for female candidates. Increased exposure also led to women and families using family planning to a larger extent leading to lower birth rates.
"It seems that women who listened to these radio shows with pro-gender-equality messages were encouraged to use their voice in elections and to take charge of their own fertility. Both subjects were discussed in the radio broadcasts," says Yoko.