The strong New Zealand dollar, which was trading at US86.30c this morning, increases the cost of goods and services purchased in this country in US dollar terms.
Sydney (US$104) was the fifth most expensive city for the date, while Melbourne (US$96.67) was in ninth place, just ahead of Auckland.
Mumbai was the cheapest city, where the date cost just US$25. But while that might sound cheap to New Zealanders, the average salary in India's financial capital is much lower than this country.
Deutsche Bank compares the cost of a range of goods and services in its annual Mapping the World's Prices study, which includes the Cheap Date Index.
An Apple iPhone 5S cost US$901.66 in New Zealand, compared with US$719 in the United States and Canada and US$720 in Hong Kong.
At least we're doing better than Brazil, where the smartphone will set you back US$1221.61, according to the study.
The research found Wellington to be one of the most expensive cities for an 8km taxi ride, with the fare costing US$29.22, ahead of New York (US$20), San Francisco (US$21), Sydney (US$23.22) and Melbourne (US$18.58).
The 8km ride cost $21.49 in Auckland.
A movie ticket cost US$14.18 in Auckland and Wellington, compared with US$13.50 in New York, US$18.22 in London and just US$3.78 in Mumbai, according to the study.
A 500ml beer in a "neighbourhood pub" in Auckland and Wellington cost US$6.02, ahead of Sydney (US$5.57), Rio de Janeiro (US$3.05), Frankfurt (US$4.59) and San Francisco (US$4.96).
Manila was the cheapest city for a tipple, with a beer costing just US$1.42. Cape Town and Johannesburg were also cheap, with beers costing just US$1.70 and US$1.80, respectively.
Meanwhile, New Zealand was the second most expensive country for buying an annual subscription to the Economist magazine, where it cost US$412.58, just behind Japan (US$412.95).
The same subscription cost just US$160 in the United States, US$50 in Indonesia and US$64.75 in China.
Australia was the most expensive major economy, while the United States was the cheapest, according to the study.