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X দ্রব্যের দাম ৪০ থেকে হ্রাস পেয়ে 70 হলে Y দ্রব্যের চাহিদা 120 একক হতে বৃদ্ধি পেয়ে 140 একক হয়। দ্রব্যদয় পরস্পর- (If the price of X commodity decreases from 80 to 70, the demand for commodity Y increases from 120 units to 140 units. The commodities are -)
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