Heatwaves are drastically altering Australian lifestyles and spending habits, according to a groundbreaking study. But how are these extreme weather events impacting the economy? The answer might surprise you.
A recent analysis of 200 million bank transactions revealed a 5% surge in consumer spending between 6 pm and 11 pm during a heatwave. This shift in spending patterns is a direct response to the scorching temperatures that gripped parts of Australia in January, with Victoria breaking maximum temperature records and New South Wales and South Australia experiencing highs above 49 degrees Celsius.
The peer-reviewed study, published in Nature's NPJ Urban Sustainability journal, delves into the spending behavior of Australians during heatwaves. Interestingly, the data shows a significant drop in daytime spending, with millions of dollars lost. But here's where it gets intriguing: the study found that this decline is followed by a 2.4% increase in spending during the seven days after the heatwave.
The research team, led by Shashi Karunanethy, a chief economist at Geografia, analyzed anonymized bank card and EFTPOS data from Westpac Group, focusing on transactions in Sydney, Melbourne, and Adelaide. These cities were chosen due to their thriving 24-hour and night-time economies, offering a unique perspective on how heatwaves impact urban life.
The data was meticulously re-weighted to account for Westpac's market share and the spending habits of customers using Westpac EFTPOS terminals. Additionally, the researchers utilized Australian Bureau of Statistics Census data to ensure the findings represented the broader population's spending patterns.
The study period, from January 1, 2023, to December 31, 2024, revealed a fascinating trend. On days when temperatures soared above 35C, classified as 'hot days' by the Bureau of Meteorology, there was a staggering $5.4 million drop in daytime consumer spending. But the story doesn't end there.
The Heatwave Effect: Before, During, and After
The study found no evidence of Australians changing their spending habits before a heatwave. However, the real impact became apparent in the days that followed. In the seven days post-heatwave, consumer spending rebounded, with a notable 2.4% increase.
"Heat shocks cause short-term disruptions to consumer activity," the researchers concluded. This disruption is most evident in the afternoon, with spending declines of 12.1% between midday and 3 pm, and 13.3% between 3 pm and 6 pm. But the evening hours tell a different story, with consumer spending surging between 6 pm and 9 pm in the days after a heatwave.
Adapting to the Heat: A 24-Hour Economy Perspective
Dr. Karunanethy's insights offer a unique window into how Australians adjust their lives to heat patterns. He explains that people find it challenging to prepare for heatwaves due to fixed work schedules and family commitments. However, they can adapt their behavior after the event.
"This is the first quantitative evidence that people are adapting to heat within the 24-hour economy cycle," Dr. Karunanethy said. Australians are either shopping late at night during a heatwave or doing so the night before or the morning after.
A Unique Australian Response: Bars, Liquor, and the Night-Time Economy
The study revealed that on hot days, consumers spent more in the morning and late afternoon on specific retail categories to avoid the heat. Spending on bars and clubs between midday and 3 pm increased by 10% during heatwaves, and this trend continued until midnight. Additionally, purchases of packaged liquor, including beer, wine, and spirits, spiked by 50% between 6 am and midday on heatwave days.
Dr. Karunanethy highlights this as a uniquely Australian adaptation, stating, "People go to bars to cool off and have drinks. This is a response we haven't seen in other global cities."
The Impact on Retail and Entertainment
The research also showed that spending on dining dropped significantly between 3 pm and 6 pm but rebounded by 9 pm. Purchases at grocers, butchers, and independent food stores, categorized as 'specialized food retailing,' saw the most significant decline between midday and 6 pm. However, these categories experienced modest gains in the morning hours, indicating a conscious effort to avoid shopping during the hottest parts of the day.
Entertainment venues like cinemas also saw consumer spending declines between 3 pm and 6 pm, with a rebound between 9 pm and midnight. Interestingly, air-conditioned department stores and shopping centers were avoided during the afternoon, challenging the assumption that these spaces are immune to climate effects.
Building Climate Resilience Through Night-Time Economies
Dr. Karunanethy emphasizes the importance of cities embracing extended retail hours and a vibrant night-time economy to mitigate the impact of heatwaves. He argues that this approach contributes to a city's overall climate resilience, allowing societies to adapt to extreme weather events.
"When cities pursue 24-hour economies, they gain a happy side benefit of climate resilience. It enables cities and societies to adapt temporally, cushioning the economic impacts of climate change," he explains. However, many regional and capital cities face constraints on trading hours, especially on weekends.
The study's key takeaway is that removing these restrictions, even temporarily, during climate events is crucial. It allows people to stock up and prepare for extreme weather, highlighting the need for flexible retail hours in building climate-resilient cities.
The Future of Heatwave-Resilient Cities
As heatwaves become more prevalent, the question arises: Are our cities ready for this new normal? Dr. Karunanethy's research prompts us to consider the adaptability of our infrastructure and urban planning to accommodate these changing behaviors. It's a controversial topic that invites discussion: How can we design cities that thrive in the face of extreme heat, ensuring both economic resilience and the well-being of citizens?
