In the book of Quantitative Finance by Schmidt, at page 5 it is given that

"Some financial markets are organized in exchanges or bourses (e.g., New York Stock Exchange (NYSE)). In other, so-called over-the-counter (OTC) markets, participants operate directly via telecommunication systems. Market data are collected and distributed by markets them- selves and by financial data services such as Bloomberg and Reuters."

so, If the financial data is distributed by the markets themselves, can't market change, say, todays data in a way that they add 1$ for the each transaction so that the next day transactions start at a higher price than what it would normally be  ?

In the book of Quantitative Finance by Schmidt, on page five it states:

"Some financial markets are organized in exchanges or bourses (e.g., New York Stock Exchange (NYSE)). In other, so-called over-the-counter (OTC) markets, participants operate directly via telecommunication systems. Market data are collected and distributed by markets them- selves and by financial data services such as Bloomberg and Reuters."

If the financial data is distributed by the markets themselves, can't a market change today's data by adding 1$ to each transaction so that the next day, transactions will start at a higher price than what it would normally be?

In the book of Quantitative Finance by Schmidt, at page 5 it is given that

"Some financial markets are organized in exchanges or bourses (e.g., New York Stock Exchange (NYSE)). In other, so-called over-the-counter (OTC) markets, participants operate directly via telecommunication systems. Market data are collected and distributed by markets them- selves and by financial data services such as Bloomberg and Reuters."

so, If the financial data is distributed by the markets themselves, can't these market owners manipulate the old data and change the future prices ?

In the book of Quantitative Finance by Schmidt, at page 5 it is given that

"Some financial markets are organized in exchanges or bourses (e.g., New York Stock Exchange (NYSE)). In other, so-called over-the-counter (OTC) markets, participants operate directly via telecommunication systems. Market data are collected and distributed by markets them- selves and by financial data services such as Bloomberg and Reuters."

so, If the financial data is distributed by the markets themselves, can't market change, say, todays data in a way that they add 1$ for the each transaction so that the next day transactions start at a higher price than what it would normally be ?