Currency in Mexico is the Mexican Peso but US Dollars are accepted practically everywhere.
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The measure WILL NOT AFFECT the amount of cash (in Mexican pesos) an international tourist can withdraw from an ATM machine on a daily or monthly basis. It is recommended that all travelers bring Mexican pesos as well as their credit and/or debit cards to minimize any inconvenience the exchange cap at banks may cause.
They are fantastic for tacos and other fast food. With 100 Pesos, tourists can also buy ice cream, fruits, or juice from the local food markets. If they do not want to spend their money on food, they can purchase a ticket to enter Tulum ruins, Chapultepec Castle, Museo Nacional de Antropologia, etc.
In Mexico, a good rule of thumb for tips is to leave 10-15% of the bill. 50 pesos would be a standard tip for a bill that was around 500 pesos. For example, if you go out for dinner and get drinks, you should expect to spend around 400 MXN. That would mean your tip would be between 40-60 MXN.
Bringing a small amount of cash in the local currency with you is always a good idea. This could help in any unforeseen emergencies where you may not be able to use your credit or debit card. Oppositely, carrying around too much cash can be inconvenient and dangerous.
For traveling (even on a backpacker budget) it is perhaps better to consider what 500 pesos (or $25 will buy). That is enough to rent a car for a way (minus non-specified expenses). It is also enough for dormitory accommodation in some of the cheapest hostels in Mexico City for two nights (around $8 per night).