Here is a question about this article: In the period before German colonisation, Samoa produced mostly copra. German merchants and settlers were active in introducing large scale plantation operations and developing new industries, notably cocoa bean and rubber, relying on imported labourers from China and Melanesia. When the value of natural rubber fell drastically, about the end of the Great War (World War I), the New Zealand government encouraged the production of bananas, for which there is a large market in New Zealand.[citation needed]
What is the answer to this question: What product significantly dropped in price at the end of World War I?
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So... natural rubber

Here is a question about this article: Barcelona is the only European club to have played continental football every season since 1955, and one of three clubs to have never been relegated from La Liga, along with Athletic Bilbao and Real Madrid. In 2009, Barcelona became the first club in Spain to win the treble consisting of La Liga, Copa del Rey, and the Champions League. That same year, it also became the first football club ever to win six out of six competitions in a single year, thus completing the sextuple, comprising the aforementioned treble and the Spanish Super Cup, UEFA Super Cup and FIFA Club World Cup. In the 201415 season, Barcelona won another historic treble, making them the first club in European football to win the treble twice.
What is the answer to this question: When did Barcelona become the first Spanish team to win the treble competitions?
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So... 2009

Here is a question about this article: High-definition image sources include terrestrial broadcast, direct broadcast satellite, digital cable, IPTV (including GoogleTV Roku boxes and AppleTV or built into "Smart Televisions"), Blu-ray video disc (BD), and internet downloads.
What is the answer to this question: Terrestrial broadcast and direct broadcast satellite are examples of what?
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So...
High-definition image sources