1. The video presented in the question basically highlights the profit-maximization strategies of a perfectly competitive firm which is essentially a price-taker meaning that it has no control over the market price of the concerned good or service in the market due to the presence of multiple or many sellers or producers in the market and the perfect elasticity of demand by the consumers for the concerned good or service. Now, therefore, the profit-maximization strategy of any perfectly competitive firm is practically contingent on choosing the quantity rather than the price in conjunction or in accordance with its profit-maximizing principle or rationale. Hence, aside from the appropriate adjustment or manipulation of the existing cost, the firms in a perfectly competitive industry or market can also emphasize the final output or quantity that would generate or ensure profit-maximization. Since the perfect elasticity of demand for the concerned good or service implies that the consumers are extremely sensitive or responsive towards any change in the good or service price, any change in the good or service price by the seller or firm would result in a significant or considerable loss in the consumers or buyers as they have many options to buy from other firms or sellers selling identical products or services. Thus, one of the ways of ensuring profit-maximization would be to adjust the quantity of output based on the market price of the concerned good or service.

2) Considering that adjusting or manipulating the cost-structure is another way to ascertain the profit-maximizing production or output level by a perfectly competitive firm by producing the final output that corresponds to the equality between the marginal cost of production and the market price of the concerned good or service, manipulation or adjustment of the output quantity is one of the generally common paths to profit-maximization in a competitive market setting. In this context, quantity manipulation or adjustment can be an effective way to achieve profit-maximization which inherently takes into account the price and marginal cost equalization. Quantity manipulation or adjustment also enables the maximization of the producer surplus in the competitive market given a fixed and constant market price of the concerned good or service thereby exerting a positive impact on the total social and economic welfare or surplus in the market considering that producer surplus is a component or determinant of the overall surplus or welfare in the market. Hence, quantity manipulation or adjustment by the perfectly competitive firms as shown in the video is also conducive to the overall welfare maximization or enhancement in the market as the competitive outcome in the market is also good for the social and economic welfare of the consumers.

3) The important facts and information that have been portrayed in the video presented in the question are mostly pertaining to one of the profit-maximization strategies by any competitive firm or seller. In this regard, the video basically emphasizes the importance or implications of appropriate quantity adjustment or manipulation by the firm or seller to achieve its profit-maximization goals or objectives in the absence of any market power or price-determining power by the competitive firm or seller. As the firms or sellers in the perfectly competitive market do not have any market power, choosing the appropriate output quantity or production level in conjunction with the profit-maximizing interaction between the product or service price and the marginal cost of production. As the firms or sellers can produce any quantity of output at the constant market price of the concerned good or service, quantity adjustment or manipulation is one of the most commonly effective means to the profit-maximization.

4) Based on historical observations and empirical facts and data, the overall economy and most of the industrial sectors in the Philippines are fairly concentrated and unregulated implying the prevalence of monopoly, duopoly, and oligopolistic market structures. This essentially implies that individual firms or businesses in various industries or markets in the domestic economy have considerable or significant market power or control over the market prices of the respective goods and services. Hence, as opposed to the perfectly competitive market structure, the firms or businesses in such concentrated industrial settings can choose or adjust the market prices of the goods and services in accordance with their profit-maximizing rationale or intentions. Therefore, price adjustment or manipulation can be a major key for these firms or businesses to achieve their profit-maximizing goals and objectives, unlike the competitive firms or businesses which ideally rely on quantity manipulation or adjustment for profit-maximization. Under non-competitive market structures such as monopoly or oligopoly, the fundamental economic key or the principle of profit-maximization is guided by the equality between the marginal cost and marginal revenue of production and choosing the market price based on the willingness to pay of the respective consumers as indicated by their respective demand curves.