Polished stone dagger Farming increases of food and causes economic inequality and conflict caused by the inequality. As a result, weapons such as polished stone daggers aiming to threaten and kill people were appeared. A dagger is a weapon to be used for fighting in close distance. Bilateral symmetry and the center of weight were considered in the progress of making and some shafts were made of wood. Some edges of the daggers had holes. Through these holes, the air went into bodies and make more bleeding. However, some daggers had too much decoration to use. These kind of daggers are estimated to be used for showing up ownersĄŻ power.