Parisian restaurants are expensive compared to the US. A nice meal for two is about $70. However, many cafes along the sidewalk, though still pricier than the US, are much more affordable, and they post their prices on boards outside so you can wander the alleys and check them out. These are probably more like $30-$40 for two.
Restaurant prices in Paris shown include taxes and service. You can even get set all inclusive menus at lunch time for about 10 euros.
In bars and cafés, prices of drinks are required to be displayed inside. It’s handy to know that the prices vary depending on whether you stand at the bar or at a table inside or on the terrace.