In 2012, the trip-planning website Tripomatic calculated one simple, fascinating statistic: In different cities across the globe, how long can US$100 ($127) last?
Presuming a traveller stayed in the cheapest possible accommodation (usually a shared dorm), took two public transportation rides per day, ate one restaurant meal per day plus two fast-food or street-food meals (no sacrifice there; street food often makes the most memorable road meals), and visited one attraction per day, Tripomatic ranked 42 cities in terms of how long US$100 would carry travellers.
The top spot went to Goa, India, at a whopping 9.62 days. The least budget-friendly was Reykjavik, Iceland, at .69 days.
The response to its Shoestring Budget Travel Guide was strong enough for Tripomatic, based in the Czech Republic, to make the survey an annual event.
The just-released data show the winner, again, is Goa, where a budget traveller can spend 9.14 days on US$100. That's particularly remarkable and partly attributable to the fact Goa is most renowned for its beaches and relaxation.
"Goa is really an extraordinary place," Tripomatic project manager Vit Janis said by email. "All of the top 10 local attractions (including caves, basilica, fort, beach) are officially for free."
Tripomatic ranked 51 cities this year, and most of the results weren't surprising. Sydney ranked at No.20, at 1.82 days, which is on par with Dubai.
In the most-travelled cities, such as New York, Paris, Rome, San Francisco, Los Angeles and Chicago, US$100 lasts barely more than a day. In Oslo, Norway US$100 lasted just 1.2 days, Reykjavik has moved to fifth-most expensive city.
The most affordable cities tended to be in still-developing Asian and Far Eastern countries: Goa, Hanoi, Bangkok and Manila.
Most interesting, perhaps, were the data's in-between jewels: Cairo, Mexico City and Lima, Peru, all showed themselves to be cost effective but only slightly more than beautiful, stable and history-drenched Prague, where US$100 lasts 3.12 days.
Buenos Aries, another stunner of a city, wasn't far behind at 2.89 days.
Berlin clocks in at 2.32 days, which might not sound like a lot compared with Goa. But it does mean your money goes further than it does in Sydney.
The data become even more interesting when compared with the 2012 results.
In Bangkok, for instance, US$100 lasts twice as long in 2013 (6.17 days) as in 2012 (3.05 days).
Some destinations became costlier, but most, like Bangkok, became cheaper, Janis said.
There are many travel insights to be culled from the results, which can be found at tripomatic.com.
US$100 LASTED THE LONGEST IN:
Goa, India (9.14 days)
Hanoi, Vietnam (7.69 days)
Bangkok (6.17 days)
... AND DISAPPEARED MOST QUICKLY IN:
Oslo, Norway (.88 days)
New York (1.1 days)
Venice, Italy (1.14 days)
Sydney, Australia (1.82)
How long do you think US$100 could last you on your travels? Which cities have you found were the most affordable? Leave a comment below.