A gold reserve has been one of the oldest forms of a reserve by many countries much longer before now, it can been considered as one of the oldest and earliest forms of a reserve adopted by most countries in much more earlier years before now. Gold ahs got this valuability that makes it a store of values as its price over time is in continuous appreciation and that show and makes it a good store of values and the the acceptability that comes with it is another reason it becomes something almost every country wants to have a reserve with it. somehow you can consider Gold a s a universal currency in that its generally acceptable in almost anywhere  you go in the world, people are always almost ready to accept gold as a good exchange for value either monetarily or for services and so it makes its valuability one that remains attractive and gives any country a reason to have it in their reserve and definitely the more countries that gets it to their reserve, the more the price will increase and the behavioral pattern of purchase will be affected too.