On August 24th, 2014, the cost of the US dollar in Argentine pesos was: 8.39
On September 2nd, 2014, the cost of the US dollar in Argentine pesos was: 8.40
Now you're probably wondering what the big deal is. After all, as long as expats have U.S. dollars, the prices are affordable more so in Argentina than they are in the States. That's a good point, but you need to consider the fact that every expat has a different financial situation. Those who continue to earn money in US dollars are better off than those who have depleted their supply of dollars (like yours truly) and are now solely dependent on Argentine pesos.
I should point out that a lot of these items have generic brands or have Argentine equivalent products that are (in most cases) cheaper.