For example, for a book, it is estimated that the total print demand in a few years is 8000 copies. Assuming that the printer's initial printing number is 4000 copies and a library can hold 4000 copies of books, is it worth printing 8000 copies at one time or 4000 copies at two times?

　　回答这个问题需要从以下几个方面考虑。

　　To answer this question, we need to consider the following aspects.

　　1.印刷费用的差别

　　1. Differences in printing costs

　　一次性印完8000册与分两次印完8000册比较，总的纸张费、印刷费、装订费是不会增加的，但分两次印刷增加了一倍的上版费。

　　Compared with 8000 copies printed in one time and 8000 copies printed in two times, the total paper fee, printing fee and binding fee will not increase, but the publishing fee will be doubled in two times.

　　上版费=印张数*2*正文上版数+方面上版费

　　Publishing fee = number of copies * 2 * number of copies of text + aspect of publishing fee

　　从以上描述可知在印刷成本上分两次印刷要比一次印刷的费用高。

　　From the above description, it can be seen that the cost of printing twice is higher than that of printing once.

　　2.资金利用的差别

　　2. Differences in the use of funds

　　一次性印完8000册，要投入全部纸张材料费用，图书印刷完毕后要全部入库占用两个库位，多占用的材料费用=（印张数*多加印数*正文纸张单价）+（封面多加用纸*封面纸张单价），图书存储库位成本=额外多使用库位*单个库位费用。即一次性印刷多占用的材料和库位的资金是份两次印刷的一倍。

　　After printing 8000 copies at one time, we should invest in the cost of all paper materials. After printing, all books should be put into storage and occupy two storage spaces. The cost of materials occupied by books should be equal to the cost of materials occupied by books (printed sheets * printed sheets * text paper unit price)+ (cover paper * cover paper unit price), and the cost of book storage space should be equal to the cost of additional storage space * single storage space. That is to say, one-time printing takes up twice as much money as two-time printing
.

　　3.读者心里的差别

　　3. Differences in the reader's mind

　　近些年来，大多数读者在购买科技书时，都比较看重出书时间和重印率，出书时间近代表书的内容新旧程度，反复重印代表书内容相对准确，书的质量较高，有更多人认可此书，所以此类图书相对好卖。

　　In recent years, when purchasing science and technology books, most readers pay more attention to publishing time and reprinting rate. The content of modern forms is new and old. Reprinting representative books is relatively accurate, the quality of books is high, and more people recognize this book. Therefore, such books are relatively good for sale.

　　综合以上三个方面考虑，在一般情况下为充分利用本单位的自有资金，提高资金周转率，减少融资贷款，降低库房使用成本，并使图书内容有进一步完善的机会，同时也为迎合读者的心理，我们建议此图书采取分两次印刷的方式。若有特殊情况，如单位的资金比较充足，而欲印的图书比较厚（印张数较大），内容比较经典不会随时间的变化而改变，并经过编辑认真加工和校对人员仔细校对后，可一次性印足8000册。

　　Considering the above three aspects, in order to make full use of the unit's own funds, improve the turnover rate of funds, reduce financing loans, reduce the cost of using the warehouse, and make the book content have further opportunities to improve. At the same time, in order to cater to the reader's psychology, we suggest that the book be printed twice. If there are special circumstances, such as the unit has sufficient funds, and the books to be printed are thicker (the number of printed sheets is larger), the content of the more classical will not change with time. After careful editing and proofreading, 8000 copies can be printed at one time.