<P> Liquor was another profitable private industry nationalized by the central government in 98 BC . However, this was repealed in 81 BC and a property tax rate of two coins for every 0.2 L (0.05 gallons) was levied for those who traded it privately . By 110 BC Emperor Wu also interfered with the profitable trade in grain when he eliminated speculation by selling government - stored grain at a lower price than demanded by merchants . Apart from Emperor Ming's creation of a short - lived Office for Price Adjustment and Stabilization, which was abolished in 68 AD, central - government price control regulations were largely absent during the Eastern Han . </P> <P> The Han dynasty was a unique period in the development of premodern Chinese science and technology, comparable to the level of scientific and technological growth during the Song dynasty (960--1279). </P> <P> In the 1st millennium BC, typical ancient Chinese writing materials were bronzewares, animal bones, and bamboo slips or wooden boards . By the beginning of the Han dynasty, the chief writing materials were clay tablets, silk cloth, and rolled scrolls made from bamboo strips sewn together with hempen string; these were passed through drilled holes and secured with clay stamps . </P> <P> The oldest known Chinese piece of hard, hempen wrapping paper dates to the 2nd century BC . The standard papermaking process was invented by Cai Lun (AD 50--121) in 105 . The oldest known surviving piece of paper with writing on it was found in the ruins of a Han watchtower that had been abandoned in AD 110, in Inner Mongolia . </P>

Which of the following was an important time in japanese history gojoseon ming heian maurya