Some relevant cultural forces to practice dowry and bride price are:  This treatment or preparation may start in early childhood for women, since it is important to safeguard the daughter's virginity as early as possible, but also to shift the “burden” that the daughter represents to the other family. Some families may not be able to afford the dowry or are forced to pay greater amounts over time, which may force other members of the family to begin working. This disproportionately puts young girls at risk, not to mention precludes poor young men from being able to marry. Currently, the bride price system is more widely practice in parts of Africa, while the dowry system exists primarily in South Asia. This is a phenomenon that has its roots all over the world and across time periods, to as early as before 0 CE. In some form, this practice existed in Babylon, Greece, the Roman Empire, and various other societies in East Asia, Europe, and the Americas. The use of dowry and bride price continues to be active around the Indian subcontinent. In 2006, there were 7600 dowry-related deaths in India, however, some there is wide variation in estimates given, because of how prevalent dowry and dowry abuse can be, not to mention the amount of resources that would be required to compile a comprehensive survey of the practice. In India, for 2001, there were 163,000 fire-related deaths of women aged 15–44; this figure collected by the World Health Organization is six times the amount given in the national crime statistics. In Southeast Asia, fire-related deaths is the third most common cause of death for women aged 15–44, while for women worldwide, it is the seventh most common. Dowry demands when left unsatisfied, often translate into violence being perpetrated against the new wives by the husbands and his families. Dowry-related violence can consist of acid burning, fire burning, physical abuse, or even the murder of newly married women when conflicts arise regarding the fulfillment of the dowry. This violence and practice is born from communities that practice son preference or preferentially value males over females. This practice reinforces other forms of abuse, such as the previously mentioned son preference or child marriage, as parents attempt to rid themselves of the burden of having a daughter. In Pakistan, like India, despite the prevalence of the dowry practice and associated violence and murders, related cases are rarely seen in the justice system, with convictions being even rarer. In India, the first nationwide anti-dowry law, the Dowry Prohibition Act, was passed in 1961.