To send cookies in an XMLHttpRequest, you can set the `withCredentials` property of the XMLHttpRequest object to `true`. This allows the request to include any cookies associated with the requested URL. Additionally, you can also set the `xhr.setRequestHeader()` method to include specific cookies in the request header. This will ensure that the cookies are sent along with the XMLHttpRequest to the server. **

No, you cannot write to a JSON file directly with an XMLHttpRequest. XMLHttpRequest is used for making requests to a server to retrieve data, not for writing data to files on the server. If you want to write data to a JSON file on the server, you would need to use a server-side language like Node.js, PHP, or Python to handle the file writing process. Once the server receives the data from the client, it can then write the data to the JSON file using the appropriate server-side code. **

To execute an XMLHttpRequest function in a called PHP file using the POST method in JavaScript, you can create a new instance of XMLHttpRequest, set the request method to POST, specify the URL of the PHP file, set the request header to indicate the content type, and send the data using the send() method. In the PHP file, you can retrieve the data sent using the $_POST superglobal array and process it accordingly. Make sure to handle any potential errors and responses from the PHP file in the JavaScript code. **

Horizontal mergers can lead to economies of scale, increased market power, and the ability to eliminate competition. By combining two companies that operate in the same industry, the merged entity can benefit from cost savings and increased efficiency. On the other hand, vertical mergers can result in better control over the supply chain, reduced transaction costs, and improved coordination between different stages of production. This can lead to improved quality control, lower production costs, and increased market access. Both types of mergers can result in increased market share and potentially higher profits for the merged entity. **

In a free market economy, it can be justified to restrict market and entrepreneurial freedom through the requirement for approval in larger mergers in order to prevent monopolies and promote fair competition. Without such restrictions, larger companies could potentially use their market power to stifle competition, leading to higher prices and reduced consumer choice. By requiring approval for larger mergers, regulators can ensure that the market remains competitive and that smaller businesses have the opportunity to thrive. This can ultimately benefit consumers and the overall economy. **