perch:member not showing value in template

I have below code in a form where i want to show first name and last name above the form. But the value does not show up.

I am however able to echo same value in layout (.php) file using "perch_member_get('first_name')" I don't know what is wrong below.

<perch:member id="first_name" /> <perch:member id="last_name" />
<perch:form id="contact" method="post" app="perch_forms">

    <center><perch:content id="intro" type="textarea" label="Intro" textile="true" editor="markitup" size="m" /></center>
    <div>
    <perch:label for="name">Name</perch:label>
        <perch:input type="text" id="name" required="true" label="Name" value="<perch:member id="first_name" /> <perch:member id="last_name" />" />
        <perch:error for="name" type="required">Please add your name</perch:error>
    </div>