Hi,
The view "listing_price" is used by several other view to display product prices.
In the "listing_price" view, the option "price_with_tax" is read from the params (and the configuration if "inherits").
You can override the option "show taxed prices" in menus, so it is possible to have different values for the product page (default configuration) and product listing (accessible thanks a menu and his own parameters).
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.