Cost of lunch vs Dinner

Why do Japanese menu at Dinner cost more than its lunch menu. Are the same items and same quantity? Never had a chance to compare,,,a tempura at a famous Ginza rest cost me Y2625 but lunch, i think would be about Y1000+

Why do Japanese menu at Dinner cost more than its lunch menu. Are the same items and same quantity?

Often the lunch menu has smaller portions, however it can also be cheaper, or have a better set items even if the portions are the same. But this isn't unique to Japanese restaurants, and it has been my experience that this is pretty standard restaurant practice all over the world.

Its all about promotion of food. As the above poster stated; this is the case for most other countries. Restaurants make cheaper prices during lunch so it will attract businessmen and women to eat there. As it is highly unlikely that an average person would purchase lunch every day for 2000+ yen. Its better for a restaurant to sell cheap instead of selling nothing at all.

In Singapore, the lunch is always cheaper than the dinner, though the latter's portion may be slightly larger.

Also, rates for weekends are also higher than weekdays but we are talking the same food!