According to stephen tongue what was one cause for tension between austria and serbia

Many Serbians wanted to claim more land from Austria-Hungary, they thought  kicking out the Ottomans wouldn't be enough. Many Serbians were living in Austria-Hungary, and they were not very happy because discrimination and shortage of supplies was common. Serbian Nationalism was a cause of World war 1, when a Serbian nationalist, Gavillo Princip, assasinated Archduke Franz Ferdinand.

disequilibrium means that either supply is greater than the demand for an available good, or that the demand for a product outstrips the available supply. it implies that the price for a is either too low creating large demand, or too high creating a large surplus of supply.