conservation , preservation ๅ’Œ reservation ็š„็”จๆณ•ๅŒบๅˆซ๏ผŒไบ†่งฃๅฎƒไปฌๅŠจ่ฏ็š„็”จๆณ•ๅŒบๅˆซๅณๅฏใ€‚ conserve ไฟๆŠคใ€ไฟๅญ˜ใ€ไฟ็•™ใ€่Š‚็บฆ๏ผ› ๅผบ่ฐƒๅฏน่ต„ๆบใ€ๆœ‰ไปทๅ€ผ็š„ไธœ่ฅฟ็ๆƒœ่Š‚็บฆ๏ผŒๅˆ็†ไฝฟ็”จใ€‚ (to keep and protect โ€ฆ The reservation price is the highest price that a given person will accept and still purchase the good. In other words, a personโ€™s reservation price is the price at which he or she is just indifferent between โ€ฆ

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