• The axes aren't synchronized; I'd like to see how they would look synchronized.
• Without referring back to the color legend, I don't know which axis goes with which metric.
• Using a dual axis chart implies there's a correlation between the two measures. There might be, but it could be displayed other way to make that more evident.
• There no indicator of the data source.

Historically, declines in Las Vegas visitor traffic have been associated with economic weakness, so the slight declines over the last two years was concerning.

• Using the footnotes to help describe the caveats in the data
• Including a reference line at zero so that it's easy to see if the country is over- or under-indexed
• Including the latest price to the right for context
• Sorting by the latest price
• Using two colors that are easy to distinguish from each other
• Subtitle explains the metrics in the viz

• The timeframe is so short that it's hard to see much change at all between the data points.
• I have no idea what happened between these two points.
• There's no explanation as to why this is the selected list of countries.
• Sizing the dots for the most recent price doesn't add much value.
• The white gridlines are too strong for my liking; I find them distracting.
• I would exclude the Euro Zone since not all Euro countries are included in the viz and it's also the only aggregate included. If you look at the chart alone without reading the article, it doesn't make sense to include it.

What I did

• I created some simple sparklines. Right after I thought about it, Rodrigo Calloni posted this viz which was nearly identical to what I wanted to create. The difference for me was that I wanted to look at the change in the price of a Big Mac over time, whereas Rodrigo looked at the change vs. the US price over time.
• I used the colors from the original viz. I liked how they worked together.
• I included some numbers for context.
• I limited the data set to only countries that had been in all of the 14 most recent surveys.
• I create a simplified mobile version that removes some of the BANs in order to fit onto the width of a mobile device.

• Nice search functionality
• Simple colors (though maybe tough for color blind people)
• The table clearly show the top 10 countries
• Being able to "Play" the visualisation and watch the map change
• Really nice tooltips
• Clicking on a country give you specific information about each of the rankings for that country

• The filled map makes it hard to see small countries and especially to see how they change.
• The up/down arrows next to the numbers clearly show better or worse, but compared to what?
• There's no sense of change because you can't easily compare years.

• I knew I didn't want to use a map, so I wanted to focus on other chart types.
• Verify which countries had data for which years
• Limit the data to only years 2000-2015 and to those countries that had data for all of those years
• Provide the user with an option to swap out for a different metric
• Provide context for all countries against each other
• Allow the user to select a country to highlight

• The title doesn't tell me much at all.
• What does each dot mean?
• Is there more to the story?
• What does being above or below the trend line actually mean?